Answer:
470 million years ago
Explanation:
Both the plants and the arthropods initially developed and lived in water. As the atmosphere was changing though, they gradually started to develop for life on land, which eventually gave birth tot he first plants and arthropods that were fully terrestrial. The first plants on land occur around 470 million years ago in the fossil records, while the first arthropods around 450 million years ago, though the genetic analyses have shown that they were present on land around 20 million years earlier. The first terrestrial plants were small, simple, and had small and not well developed roots. The first arthropods though, the millipedes, centipedes, and scorpions, were almost identical to the ones we have in the present, being well developed and adapted for terrestrial life.
Answer:
444 Ma
Explanation:
what is the theory of evolution?
Answer:
In biology, evolution is the change in the characteristics of a species over several generations and relies on the process of natural selection. The theory of evolution is based on the idea that all species? are related and gradually change over time.
The use of DNA as evidence in criminal investigations became possible
because of the?
The use of DNA in criminal cases became possible due to discoveries in the mid-20th century that proved DNA is the genetic material, leading to techniques like DNA fingerprinting and genomic analysis utilized in cases like the 2001 FBI anthrax investigation.
Explanation:The use of DNA as evidence in criminal investigations became possible thanks to pivotal discoveries in the twentieth century that identified DNA as the genetic material. Groundbreaking experiments by scientists like Griffith and later by Avery, MacLeod, and McCarty laid the foundation by establishing that DNA, and not protein, is the key molecule of heredity. This scientific milestone paved the way for the development of DNA fingerprinting by Dr. Alec Jeffreys, which facilitated the retrieval and analysis of DNA from biological samples such as hair, blood, or saliva. Virtually every individual has a unique DNA sequence, which allows forensic experts to use these genetic markers in the identification process and in solving crimes. The first landmark use of genomics in a forensic case emerged in 2001, with the FBI's investigation into bioterrorism involving anthrax.
Moreover, DNA analysis has transcended its forensic applications and is used in areas such as genealogy, medical diagnostics, vaccine development, and cancer therapy.
Genomic analysis remains an invaluable tool in both legal contexts for evidence validation, as well as in broader scientific research and healthcare practices.
What is the purpose of biofertilizers?
a reduce pollution
b. reduce insect threats
c. reduce erosion
d. reduce herbicide use
Please select the best answer from the choices provided
The purpose of biofertilizers is to reduce pollution, which is in Option A because the pollution occurs in the soil, and when the soil is washed away, the pollution from the soil enters the water, causing water pollution, and so on.
What are biofertilizers?The purpose of biofertilizers is to increase soil fertility and crop productivity by introducing beneficial microorganisms, such as bacteria and fungi, and to reduce soil and water pollution, these biofertilizers are considered as an eco-friendly and sustainable alternative to synthetic fertilizers, as the synthetic fertilizers have negative impacts on soil health because it contains chemicals that cause soil acidification, nutrient depletion, and overall harm soil fertility etc.
Hence, the correct answer is that the purpose of biofertilizers is to reduce pollution, which is in Option A among all the other options.
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A species of fly has two alleles for the length of their legs. The allele for long
legs is dominant, and is represented by p. The allele for short legs is
recessive, and is represented by q. If 21 of 100 organisms have short legs,
what is p?
p'+ 2pq + q* = 1
O A. 0.54
OB. 0.21
O C. 0.79
O D. 0.46
If 21 of 100 organisms have short legs (q2 = 0.21 >> q = 0.46), then the value of p is equal to 0.54.
What is the Hardy-Weinberg equilibrium?Hardy-Weinberg equilibrium is a model used in population genetics to estimate genetic and allele frequencies.
This model (Hardy-Weinberg equilibrium) is used to estimate allele frequencies in absence of different evolutionary forces.In conclusion, if 21 of 100 organisms have short legs (q2 = 0.21 >> q = 0.46), then the value of p is equal to 0.54.
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What protects the lining of the stomach from acidic gastric juices?
Answer:
Small pores called gastric pits
Explanation:
Small pores called gastric pits protect the lining of the stomach from acidic gastric juices.
Hope this helps!
Answer:
What protects the stomach lining of gastric juices is the Gastric Mucosa.
Explanation:
The Gastric Mucosa is the lining of the stomach, which consists of an internal epithelium, a middle mocous membrane and an external muscularis mucosae. The superficial cells produce mucus that protects the stomach from the attack of acid and digestive enzymes. When the epithelium invaginates within the mucous membrane in various regions of the stomach, different tubular gastric glands are formed. These glands are made up of cells that secrete mucus, enzymes, hydrochloric acid and hormones.
The stomach mucous lining the inside of the stomach with the thickness and texture necessary for our digestive organ not suffer the effects of their own corrosive juices. This mucus lubricates the food bolus to circulate easily through the digestive tract and also forms a thick coating on the inner wall of the stomach to prevent, precisely, being digested by their own juices.
The acids attack, of course, this mucuous wall, but the stomach wall regenerates them continuously. In addition, the stomach lining makes its own antacid, secreting bicarbonate to neutralize the acid.
the maintainnce of healthy bones depend on the balance of osteoblast and osteoclast activity, predict what would happen if osteoblast activity exceeds osteoclast activity?
Answer:
If the activity of osteclasts(which demineralize bone) exceeded osteoblast activity(production of new bone), then the bone's mineral content(and thus its mass) would decline, making it weaker.
If osteoblast activity exceeds osteoclast activity, there could be an increase in bone density but potentially abnormal bone structure due to imbalanced bone remodeling. Drugs may be used to help balance osteoblast and osteoclast activity to maintain healthy bones.
Explanation:The balance between osteoblast and osteoclast activity is crucial for the maintenance of healthy bones. Osteoblasts are cells that form new bone, while osteoclasts are responsible for breaking down old bone tissue. This process of breakdown and reformation is continually ongoing to remodel the bone tissue.If osteoblast activity exceeds osteoclast activity, it means that bone formation is occurring at a faster rate than breakdown. This could lead to an increase in bone density as more bone material is deposited than resorbed. However, it could also potentially result in abnormal bone structure if the remodeling process is not balanced, as the bones may not properly reshape according to the body's needs.In certain cases, therapeutic drugs may be introduced to balance osteoblast and osteoclast activity. Some drugs can inhibit overly active osteoclasts or promote osteoblasts to maintain a healthy bone structure.It's important to remember that the balance between osteoblasts and osteoclasts fixation and absorption activities play an integral role in our body's skeletal health.
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What is the difference between an acidic solution and a basic solution?
The difference between an acidic solution and a basic solution lies in their pH value and hydrogen ion concentration. Acidic solutions have a pH less than 7 and high hydrogen ion concentration, while basic solutions have a pH greater than 7 with lower hydrogen ion concentration.
The main difference between an acidic solution and a basic solution lies in the pH value and the concentration of hydrogen ions (H+ or H3O+). An acidic solution has a pH less than 7 and a higher concentration of hydrogen ions, which means [H3O+] > 10-7 M. Conversely, a basic solution, also known as alkaline, has a pH greater than 7; this indicates a lower concentration of hydrogen ions, or in other words, [H3O+] < 10-7 M. A neutral solution stands exactly at a pH of 7, meaning [H3O+] = 10-7 M, with equal concentrations of hydrogen and hydroxide ions.
Acids are substances that increase the concentration of hydrogen ions when dissolved in water, while bases decrease it. This ion concentration is a critical factor in determining a substance's acidity or basicity. Solutions with pH values lower than 7 are considered acidic, while those with pH values higher than 7 are seen as basic. For example, gases like CO2, NO2, and SO2 can dissolve in water to form weak acids, which is why rainwater is naturally slightly acidic.
Which of the following structures is a double layer of phospholipids with
proteins?
A: cytoplasm
B: cell membrane
C: ribosome
D: cell wall
The double-layered structure of phospholipids with proteins is known as the cell membrane. It separates the interior of the cell from the external environment and the embedded proteins perform important functions.
Explanation:The structure you're referring to, a double layer of phospholipids with proteins, is known as the cell membrane (Option B). This boundary, also termed plasma membrane, separates the cell’s interior from its external environment. The phospholipids form a 'bi-layer' with their hydrophobic (water-repelling) tails pointing inwards and their hydrophilic (water-attracting) heads facing outwards.
The proteins embedded within this structure carry out a variety of essential functions such as transporting substances in and out of the cell.
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Salazar made a chart to describe some relationships among species. Relationships among Species X Y Boxing crabs gently carry anemones in their claws to sting predators and keep them away. The anemones feed off bits of food the crab drops. Fleas live on the warm body of a dog, biting the dog and eating its blood. The flea bites cause the dog to itch. Which headings best complete the chart? X: Competition Y: Parasitism X: Competition Y: Commensalism X:Commensalism Y: Mutualism X: Mutualism Y: Parasitism Mark this and return
The headings that best complete the chart are X: Commensalism and Y: Parasitism.
Explanation:The headings that best complete the chart are:
X: Commensalism - Boxing crabs gently carry anemones in their claws to sting predators and keep them away. The anemones feed off bits of food the crab drops.Y: Parasitism - Fleas live on the warm body of a dog, biting the dog and eating its blood. The flea bites cause the dog to itch.In the first relationship, the boxing crabs and the anemones have a commensal relationship because the anemones benefit from the shelter and food dropped by the crab, while the crab is not affected. In the second relationship, the fleas are parasites because they benefit by feeding on the dog's blood, while the dog is harmed by the bites and itching caused by the fleas.
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Why are archaea in a different domain from bacteria?
A. They had independent evolutionary development.
B. They shared a common ancient ancestor.
C. They are eukaryotes, but bacteria are prokaryotes.
D. They are multicellular, but bacteria are unicellular.
There are archaea in a different domain from bacteria, They had independent evolutionary development.
Why are archaea in different domain from bacteria?Archaea differ from bacteria in cell wall arrangement and differ from both bacteria and eukaryotes in membrane design and rRNA type.
These contrasts are important enough to warrant that archaea have a separate domain.
Thus, option "A" is correct, They had independent evolutionary development.
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A. They had independent evolutionary development.
Correlational studies show that prolonged viewing of televised violence______increase rates of violent behavior
a) inhibits
b) causes
c) is unrelated to
d) predicts
ANSWER:
The correct answer is Predicts.
EXPLANATION:
Prolonged viewing of violent TV programs leads to those viewing the violent programs to react in a violent manner to situations in routine life. When one watches a violent TV program in which a good character reacts violently to a situation, it is accepted by the viewers as the right way of dealing with situations. Therefore, it can be predicted that most viewers will react to the situation violently like the good character of the program.
Correlational studies suggest that prolonged viewing of televised violence predicts higher rates of violent behavior. This doesn't imply causation, meaning that other factors might also contribute.
Explanation:Correlational studies show that prolonged viewing of televised violence predicts increase rates of violent behavior. Correlational studies observe a relationship between two or more variables without influencing either one of them. In this case, the variables in question are the prolonged viewing of televised violence and the increase in rates of violent behavior. This does not mean that watching violent television directly causes violent behavior. Rather, the research suggests that there is a possible relationship or association between the two. There may be other contributing factors involved, such as individual personality traits or environmental factors.
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What would be the result if crossing over did not happen during meiosis in
humans?
A. There would be less genetic variation in humans.
B. Parents would be more likely to look like their children.
C. The human population could not reproduce.
D. Children would have more chromosomes.
Answer:
A.There would be less genetic variation in humans
Explanation:
During the process of crossing over chromosomes of a homologous pair exchange equal segments with each other. This results in new combinations of genes in the gametes that are not found in either parent, contributing to genetic diversity. Therefore, if this did not occur there would be less genetic variation in humans
There would be less genetic variation in human, if crossing over did not happen during meiosis in humans. thus option A is correct.
What do you mean by crossing over in genetics?
The crossing over is a process that is essential to human genetic diversity. During the crossing over parts of the homologous chromosomes ( two chromosomes identical by structure, but different in origin, one inherited from the mother and one from the father) randomly exchange parts of their sequences.
If the crossing-over didn't exist, this would greatly decrease the genetic diversity because the chromosomes would always be passed o the next generations unchanged.
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Question 1
A potato is soaked in a solution of 1 cup of salt to 1.5 cups of water for one hour. After one hour the potato feels _____________ because it was in a ______________ solution.
Answer:
flaccid, hypertonic.
Explanation:
It became flaccid due to the low water potential in solution outside of potato cells, hence causing water to leave the potato cells & move into the solution.
Hypertonic solution simply means the concentration of solute is higher & water potential is lower than in potato cells.
Final answer:
A potato soaked in a strong salt solution will feel shrivelled due to water moving out of it, as it was in a hypertonic solution.
Explanation:
A potato soaked in a solution of 1 cup of salt to 1.5 cups of water for one hour will feel shrivelled because it was in a hypertonic solution. This occurs because the concentration of solutes is higher in the solution outside the potato compared to inside, creating a condition where water moves out of the potato into the surrounding solution to balance the concentration levels. This osmotic process leads to the potato losing water, hence the shrivelled texture.
Which of the following join together to form molecules? Atoms Organisms Organs Tissues
Answer:
Atoms
Explanation:
Answer:
Atoms
Explanation:
They are the smallest unit of matter than we can identify.
(6.02 MC)What affect do marine protected areas have on environmental quality?
They increase environmental quality by preventing resource overuse.
They increase environmental quality by adding new species.
They decrease environmental quality by removing all human activity.
They decrease environmental quality by adding recycling facilities.
Answer:
They increase environmental quality by preventing resource overuse.
Explanation:
Marine protected areas are regions of the seas and oceans that are restricted from human activities.
The goal of marine protected areas is to conserve naturally available resources in the ocean. To conserve resources, materials are used resonably in order to prevent them from being limited in terms of availability.
When a marine area is protected, the enviromental quallity improves because biodiversity of life and resources can be perfectly in check.
Why would a rough, steep mountain habitat have a higher rate of speciation than a large, open grasslands habitat??
A rough, steep mountain habitat will have much higher rate of speciation than an open grassland habitat, and there are few reasons for that. The rough, steep mountain will have several biomes, depending on the elevation, as the climate is changing with the elevation, thus the living conditions are different. This results in different types of organisms at each biome in accordance with the elevation, so there will be much more different species because of the specializations required. The mountain will also act as a natural barrier for the air masses, resulting in the windward side being much more moderate in the temperature and wetter. The leeward side, on the other hand, will be much drier and warmer. This will result in further specialization, by having different habitats on the two different sides of the mountain even though the elevations are the same. The open grassland habitat will have much less speciation, with the prime reason being that it has monotonous conditions, thus the organisms will be the same all over it as the conditions are the same all over ti.
Answer: The mountain would isolate subgroups of the population.
Explanation: APEX 8/22/19
name the star closest to our solar system
Answer:
See explanation below.
Explanation:
The star that is nearest to our solar system is Proxima Centauri. It is about 4.22 light years away. That means if you travel at the speed of light, it will take you 4.22 years to travel from here to there.
Hope this helps! Have an Awesome Day!! :-)
which of the following is not an autotroph
Dog is not an autotroph .Dogs cannot produce their own food they are consumers and rely on eating other organisms to obtain energy.
The correct option is D .
Autotrophs are organisms that can produce their own food by converting inorganic substances into organic compounds through processes like photosynthesis or chemosynthesis. Dogs are not autotrophs; they are heterotrophs, which means they rely on consuming organic matter (such as food) to obtain the energy and nutrients they need to survive.
Autotrophs, on the other hand, can create their own food using energy from sunlight (in the case of plants and algae) or from chemical reactions (in the case of certain bacteria).
The complete question is :
which of the following is not an autotroph ?
A) Sunflower
B) Butterfly
C) Algae
D)Dog
Hence , D is the correct option
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What do all macromolecules have in common with each other?
O
A. They all are formed from the same elements.
O
B. They all have major roles in cell membranes
O
C. They all act as catalysts in the body.
O
D. They all have peptide bonds between carbon atoms.
The common feature of all macromolecules is that they are formed from the same elements.
WHAT ARE MACROMOLECULES?
Macromolecules are large (polymeric) organic molecules composed of units. There are four major macromolecules in nature namely;CarbohydratesProteinsNucleic acidsLipidsSince all of these four macromolecules are organic in nature, they are formed from similar elements. All macromolecules are composed of carbon, oxygen, hydrogen atoms.Hence, The common feature of all macromolecules is that they are formed from the same elements.
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Identify the two layers of Earth where seismic Swaves do not travel
Upper mantel
lower mantle
outer core
inner core
Answer: outer core and inner core
: Seismic waves do not travel through the upper mantle, lower mantle, outer core, or inner core. Seismic waves are waves of energy that are generated by earthquakes or other disturbances in the Earth's crust. There are two main types of seismic waves: P-waves (primary waves) and S-waves (secondary waves).
What are P waves ?P-waves are longitudinal waves that travel through the Earth's interior by compressing and expanding the material they pass through. S-waves, on the other hand, are transverse waves that move perpendicular to the direction of wave propagation.
S-waves can only travel through solid materials and are therefore blocked by the liquid outer core and the solid inner core of the Earth.
The upper mantle and lower mantle are both solid layers of the Earth's interior and are able to transmit both P-waves and S-waves. However, the outer core is a liquid layer, and S-waves cannot propagate through liquids. The inner core, although solid, is under such intense pressure that it behaves like a liquid with respect to seismic waves, and S-waves cannot pass through it either.
The fact that S-waves do not travel through the outer and inner core has been instrumental in helping scientists understand the internal structure of the Earth.
By analyzing the way that seismic waves are reflected and refracted as they pass through the Earth, scientists can create models of the Earth's internal composition and infer details about the density, temperature, and other physical properties of its different layers.
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What happens when a scientific theory is shown to be an accurate description of a phenomenon?
When a scientific theory is shown to be an accurate description of a phenomenon, It's tested by other scientists to replicate the experiment and confirm the findings.
A scientific theory refers to an explanation of an aspect of the natural world that may be tested over and over again as well as verified according to the scientific method, utilizing accepted protocols of observation, measurement, and evaluation of results. Theories tend to be tested under controlled conditions in an experiment.
Which statements are true regarding the cosmological principle? 1 The universe looks the same from all directions, but can change and evolve over time. 2 The universe looks the same from all directions, and hasn't and won't change or evolve over time. 3 The universe can't be studied scientifically because scientists can't directly test their hypotheses. 4 Scientists can study the universe because the cosmological principle suggests that any physical laws or processes are the same for the entire universe.
There are two correct statements, they are:
1. The universe looks the same from all directions, but can change and evolve over time.
4. Scientists can study the universe because the cosmological principle suggests that any physical laws or processes are the same for the entire universe.
Final answer:
The cosmological principle asserts that the universe is homogenous and isotropic; the true statements regarding this principle are 1. The universe looks the same from all directions, but can change and evolve over time and 4. Scientists can study the universe because the cosmological principle suggests that any physical laws or processes are the same for the entire universe.
Explanation:
The cosmological principle is a fundamental assumption in our understanding of the universe. It states that on a large scale, the universe is homogeneous and isotropic, meaning it is the same in all directions and locations. Regarding the student's question, the first and fourth statements are true:
The universe looks the same from all directions, but can change and evolve over time.Scientists can study the universe because the cosmological principle suggests that any physical laws or processes are the same for the entire universe.These statements align with current evidence, including the expansion of the universe as observed by Hubble and later research, which implies the universe's uniformity, apart from evolution over time. Models like the Big Bang theory are built on the cosmological principle. It has enabled us to understand not just our local part of the universe but to make scientific predictions about the universe as a whole, its structure, origin, and potential fate. It is important to note that scientific knowledge could change with new information, but basic scientific principles have withstood the test of time.
Which statement about plant classification below is true?
A. No nonvascular plants bear seeds, but not all vascular plants bear seeds
B. Not all nonvascular plants bear seeds, but all vascular plants do bear seeds.
C. All vascular plants are angiosperms, but not all nonvascular plants are mosses.
D. Not all angiosperms produce flowers, but all gymnosperms produce cones.
Answer:
A. No nonvascular plants bear seeds, but not all vascular plants bear seeds
Explanation:
Nonvascular plants are those that do not have conductive vessels (xylem and phloem), in addition, nonvascular plants do not have seeds, fruits or flowers.
Some examples of nonvascular plants are mosses and liverworts.
Most vascular plants (have conductive vessels) have seeds, as in the case of angiosperms and gymnosperms, however, there are also some species of seedless vascular plants, represented by the lycopods and especially the pteridophytes, which are in greater number.
Examples of seedless vascular plants: ferns and horsetails.
What makes a resource sustainable
Answer:
The answer is the good use of natural resources.
Explanation:
What makes a resource sustainable, is the sustainable use of these natural resources, which consists in using them in a rational way, conserving the environment in such a way that we can continue enjoying it and taking advantage of it in the future. Protection and harmony with the environment are factors that allow resources to be sustainable, which is important for development and for improving the quality of life of the population.
Proper use, conservation and recycling of resources will ensure that a resource is sustainable.
What are resources?Resources are those materials found in the natural environment used by man to for his immediate use as well as for production of other goods.
Examples of resources are water, plants, minerals, etc.
Proper use and conservation of resources will ensure that a resource is sustainable as it those resources will last for a longer time.
Also, recycling and reusing of resources will make it sustainable.
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Gene therapy is a form of
Answer:
is an experimental technique that uses genes to treat or prevent disease.
Explanation:
Answer:
Gene therapy is a form of Genetic Engineering
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What is DNA? Where is it found?
DNA stands for deoxyribonucleic acid. it's located in the cell nucleus. DNA is the molecule that has the genetic code of organisms.
Answer:
DNA is a self replicating material which is present in almost all living organisms as the main constituent of chromosomes. It is also the carrier of genetic information.
DNA is located in the cell nucleus where it is called nuclear DNA.
And small amount of DNA can also be found in the mitochondria where it is called mitochondrial DNA.
George went to a dinner party thrown by his company. He was seated with his colleagues when the server bought in the food. The first server put
vegetables on his plate. He noticed that the server had put the vegetables in one specific corner of the plate. If the area of the plate was divided in terms
of the numbers on a clock, where did the server put the vegetables on George's plate?
The server put the vegetables between ____ the
and _____
areas of the plate.
First blank
12 o'clock
3 o'clock
9 o'clock
Second blank
11 o’clock
6 o’clock
5 o’clock
Need help !!
Answer:
Between 3 o'clock and 11 o’clock
Explanation:
true or false the coast is never destroyed by waves
Answer:
false?
Explanation:
anytime a wave hits the shore, it displaces a small amount of sediment, so technically its always destroying it but rebuilding it at the same time.
What word is used to describe differences of individual organisms
Answer:
Variation.
Explanation:
Variation describes differences between organisms.
The word used to describe the differences of individual organisms is 'variation'. Variation in organisms can result from genetic differences or differential gene expression, making each individual unique. The complexity of these variations contributes to the challenges in defining biological species and classifying living organisms.
Explanation:What Word Is Used to Describe Differences of Individual Organisms?
The word used to describe the differences of individual organisms is variation. These variations arise due to the unique DNA makeup of each organism, leading to a wide array of biological diversity. Every organism, including humans, exhibits variation in their genotype and phenotype, which are evident in the natural world's complexity. This is why, even among organisms classified within the same species, we observe notable diversity in physical traits, behaviors, and genetic makeup.
Understanding Variation in Biology
Variation is a fundamental concept in biology that explains the differences between individuals within the same species and between different species. These differences can be minor, like varying colorations among individuals, or significant enough to affect their physiological functions. Such variations are not only due to differences in the genetics of each organism, which could lead to conditions like sickle cell anemia, but also due to gene expression. For instance, despite having the same genetic information, two cells in an organism can function differently due to the specific genes that are active (expressed) within each cell.
Moreover, defining a species is a complex task because it involves a multitude of factors such as behavior, genetics, and morphology. While the Linnaean classification system placed organisms into hierarchical categories based on shared traits, the concept of a species has evolved to account for the underlying genetic and phenotypic variations that are emblematic of life's evolutionary history.
Which example best represents the adhesion, cohesion, and surface tension of water?
A.
Ice forming on the surface of water bodies in winters
B.
The ability of water to dissolve many substances
C.
Water droplets forming a bead-like shape over a glass table