1.04 Properties of Water
Question: What effect will adding soap to water have on surface tension?
Hypothesis: If, soap is added to the water slowly dropped on a penny then, the penny will hold more water.
Independent/Dependent/Control Variables: Independent: the amount of soap/oil; Dependent: the penny; Control: amount of oil/water given
Materials: 3 cups, water, canola or olive oil, dish soap, a pipette and or needle/syringe, pennies
Procedure:
· Gather three identical cups
· Add water to the first one (1/3 cup of water in each), add water and soap in the second one, and olive or canola oil in the third.
· Lay out three pennies.
· Take pipette and slowly bring water in from cup #1, drop onto penny until water falls over, record results of how many drops it took.
· Repeat with cup numbers 2-3 and record information/data.
Data/Observations: With the regular water on a penny, I noticed that only 13 regular drops could fit on without falling over.
With the water+soap, it got up to 24 drops before falling over. Then on the 25th drop, the mixture fell off.
With the oil, it was the highest at 29 drops before falling over slowly. Therefore, oil holds the most surface tension in this experiment.
Which structures are found in both animal and plant cells? Check all that apply.
cell membrane
cytoplasm
Golgi body
nucleus
ribosome
vacuole
What is the maximum number of hours that food can be held in the food danger zone?
The maximum number of hours that food can be held in the food danger is zone is 2 hours. Beyond this, food is suspected to have high amounts of bacteria that may cause illness and is recommended for disposal.
Further Explanation:
The food danger zone is the temperature range between 40°F to 140°F. At these temperatures, bacteria grow more rapidly than at other temperatures. At extremely low and high temperatures, bacteria die, but at the food danger zone, they have the temperature that is most suitable for their growth. Bacteria need food, water, and the proper environmental conditions in order to grow and multiply. At 40°F to 140°F (food danger zone), bacteria multiply quickly, with their number doubling within 20 minutes. At this rate, bacteria levels in the food rise making it unsafe for consumption.
It is recommended, therefore, to keep food at temperatures below or well-above the danger zone. Before serving, cold food must be iced and kept at temperatures equal to or below 40°F and hot food warmed at temperatures above 140°F in warming containers and dishes.
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Neurons are surrounded by ________, which guide neural connections and clean up after neurons send messages to one another.
Neurons are surrounded by glial cells, which play a critical role in guiding and maintaining neural functions and outnumber neurons tenfold. In addition to supporting neurons, glia also modulate communication between nerve cells and can be implicated in brain disorders when mutated.
Explanation:Neurons are surrounded by glia, which guide neural connections and clean up after neurons send messages to one another. Glial cells, often known as the supporting cells of the nervous system, are crucial for the functioning of neurons. They outnumber neurons by a factor of ten and fulfill multiple roles, including guiding developing neurons, buffering harmful ions and chemicals, and insulating axons with myelin sheaths. Not only do glia perform these important support functions, but recent discoveries suggest that they also contribute to nerve activity response and communication modulation between nerve cells. Dysfunctions in glial cells can lead to severe consequences, such as brain tumors, which are mostly caused by mutations in these cells.
MULTIPLE CHOICE VERY EASY!!!!!
Which statement about the members of a population that live long enough to reproduce is consistent with the theory of evolution by natural selection?
A. They are the ones that are best adapted to survive in their environment.
B. They will perpetuate unfavorable changes in the species.
C. They transmit characteristics acquired by use and disuse to their offspring.
D. They tend to produce fewer offspring than others in the population.
The statement 'they are the ones that are best adapted to survive in their environment' is consistent with the theory of evolution by natural selection (Option A).
Natural selection is the main mechanism by which evolution occurs.Natural selection refers to the differential survival and reproduction of individuals of a given population that live in a particular environment.According to the evolutionary theory, individuals that live more time will have more chances to reproduce and thus pass their genes to the next generation.In conclusion, the statement 'they are the ones that are best adapted to survive in their environment' is consistent with the theory of evolution by natural selection (Option A).
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Final answer:
The correct answer to the question is A, suggesting that members of a population that live long enough to reproduce are the ones best adapted to their environment as per the theory of evolution by natural selection.
Explanation:
The question you've asked relates to how traits are passed on within a population in the context of the theory of evolution by natural selection. Drawing from the concept of natural selection, the correct option that is consistent with the theory is: option A. They are the ones that are best adapted to survive in their environment.
This is because individuals in a population that possess advantageous traits are more likely to survive and reproduce. These advantageous traits are then inherited by their offspring. Over time, the population evolves as these traits become more common, and the population as a whole becomes better adapted to its environment.
How does the melting of the ice caps affect the amount of salt in the water?
Melting glaciers and polar ice caps add fresh water to the ocean, potentially decreasing its salinity. The amount of change in salinity varies regionally and is influenced by various factors, including thermal expansion of water and increased acidity of the seas due to carbon dioxide absorption.
Explanation:As glaciers and polar ice caps melt due to global warming, a significant amount of fresh water that was previously frozen is added to the oceans. This influx of meltwater can dilute the seawater, potentially decreasing the overall salinity of the ocean. However, because the ocean is vast, the change in salinity is not uniform and can vary in different regions.
Melting sea ice, such as icebergs already floating in the ocean, does not directly contribute to changes in salinity since this ice is already part of the ocean's water volume. In contrast, the melting of land-based ice, such as glaciers, adds fresh water not previously accounted for in the sea level, which can reduce the salinity of the seawater around the melting points.
Meltwater from glaciers, combined with the thermal expansion of seawater as it warms, contributes to the rise in global sea levels. This phenomenon not only affects global circulation patterns by altering the density and thus the buoyancy of seawater but also poses a threat to marine ecosystems and coastal communities through increased acidic seas and changing shorelines.
The Principle of Original Horizontality is the most Select one:
a. biased method to date rocks.
b. complicated method to date rocks.
c. biased explanation for why sediments form layers.
d. creative explanation for why sediments form layers.
Final answer:
The Principle of Original Horizontality states that sediment layers are originally deposited horizontally, and any tilting indicates post-depositional tectonic activity.
Explanation:
The Principle of Original Horizontality is neither biased nor complicated; it is a foundational concept in geology that states layers of sediment are initially deposited in horizontal formations due to gravity. If we observe that sedimentary rock layers are tilted, it suggests that such tilting occurred after the deposition due to tectonic forces altering their orientation. This principle is critical in the relative dating of rocks, allowing geologists to infer that any folds, tilts, or distortions in the strata occurred post-deposition, providing information about the geologic history of the region.
If a dog is identified by scanning the shoulder or neck of the animal, what provides the information about the dog?
Which statements are correct concerning the creation model:
a. basic kinds of life forms were created by the direct act of God
b. numbers of all species life forms will increase with time
c. every lower life form can be traced back to the same common ancestry
d. basic life forms continued to reproduce their own kind within limits of variation
Answer:
The correct answer is a. basic kinds of life forms were created by the direct act of God.
Explanation:
According to the bible and Christianity, there is a creation model which proves that the earth was created by God and life forms present on earth is also created by god.and the organism living.
Creation model says that god destroyed the early earth because it became corrupt and created one more earth on which we are living now. According to the creation model, the creation of earth was completed in 6 days which were 24 hours long.
So, according to the creation model, the correct statement is a. basic kinds of life forms were created by the direct act of God.
Stress ________ activity in the sympathetic division of the autonomic nervous system. stress also _________ activity in the parasympathetic division.
________ refers to any condition affecting the structures or function of the cardiovascular system, and affects more than 70 million americans
Answer:
Heart disease affects over 70 million people across the world. It is a very serious disease that needs to be made aware of.
Explanation:
What makes sperm cells and egg cells different from almost all other types of body cells.
Sperm cells and egg cells are involved in reproductive functions, while somatic cells are involved in growth and maintenance of body.
What is the difference between somatic and sperm cells?Sperm cells and egg cells are specialized cells that are involved in sexual reproduction and produced through meiosis process. Sperm cells are typically small in size. It has a long tail and a pointed head to penetrate and fertilize the egg cell. Egg cells are much larger in size and rounder in shape. It has a thick outer layer to protects the cell from fertilizing by the sperm cell, while somatic cells are used in growth and maintenance of body.
Sperm cells can survive for a few days outside the male reproductive tract, while egg cells are only viable for a short period of time after ovulation.
The sperm cells and egg cells contain specialized proteins that are involved in the fertilization process and early embryonic development. These proteins and enzymes are synthesized within the sperm cells to help the sperm cells to penetrate the egg cells for fertilization, and successful fusion of the sperm and egg cells. However, somatic cells are not involved in fertilization process.
Therefore, sperm cells and egg cells combine together to form a zygote and create a new life, while somatic cells cannot form zygote.
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A fruit fly is classified as a heterotroph because it is unable to do what
What is a disadvantage of using a stem-and-leaf plot instead of a histogram?
Answer:
abd are right
Explanation:
Why is an untreated acute allergic reaction a life-threatening situation?
An untreated acute allergic reaction can turn life-threatening as the symptoms can escalate rapidly and be potentially harmful.
An untreated acute allergy can also lead to anaphylaxis. Anaphylaxis is a sudden and serious potentially life-threatening allergic reaction.
Anaphylaxis includes symptoms such as irregular pulse, difficulty swallowing and breathing, hyperventilation, fainting, low blood pressure and shock. It can even result in death.
Therefore, it is very important to treat acute allergic reactions.
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Providing energy, insulating body organs, and maintaining body temperature are functions of
Providing energy, insulating body organs, and maintaining body temperature are functions of fats.
Fat is a lipid material of various types and characteristics, it is found in adipose tissue and in other parts of the body.
In the body, fats contribute to the support of the organs, provide protection against the cold and allow the production of energy.
In addition, they fulfill various vital functions, such as serving as a structure to produce hormones and other substances and facilitate the transport of various vitamins.
Fat provides cushioning in certain areas of the body that serves as elastic mechanical protection against pressure.
Dietary fats, like other nutrients, provide energy: about 9kcal / gram, this is what is called caloric intake or calories.
Therefore, we can conclude that providing energy, insulating body organs, and maintaining body temperature are functions of fats.
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Adipose tissue or body fat handles the functions of providing energy, insulating body organs, and maintaining body temperature. It stores energy in the form of triglycerides, insulates the body to conserve heat and protect underlying organs.
Explanation:The functions of providing energy, insulating body organs, and maintaining body temperature are primarily fulfilled by adipose tissue, or body fat. Adipose tissue serves as a site for long-term energy storage, where nutrients obtained from food are converted to ATP for short-term use while some are stored as triglycerides for prolonged use. Insulation comes from the form of fur, feathers, or fat in animals. In humans, it's the layer of fat that serves as insulation, keeping our bodies warm by conserving heat.
This adipose tissue, which is found in the hypodermis layer of the skin, also forms a 'cushion' protecting underlying organs from damage. Furthermore, bioenergetics in animals shows that no energy system is 100% efficient, and an animal's metabolism produces waste energy in the form of heat. But thanks to insulation provided by adipose tissue, this heat can be conserved to maintain a fairly constant body temperature.
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Which type of immunity occurs when antibodies pass from mother to fetus via placenta or from mother to baby via breast milk?
Naturally acquired passive immunity is a type of immunity that occurs when antibodies pass from mother to fetus via placenta or from mother to baby via breast milk. This occurs when a person (or a baby) is exposed to a live pathogen (which came from the mother), and develop a primary immune response which may then lead to immunological memory.
Answer:
Antibodies, immunity occurs when a mother breastfeeds her baby.
Explanation:
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is the earth getting larger and wider when plates drift away from each other?explain
The Earth does not get larger when plates drift apart because new crust formation at divergent boundaries is balanced by crust destruction at subduction zones.
The theory of plate tectonics explains how continent drift is caused by slow motions in the Earth's mantle moving large portions of the crust. A divergent boundary occurs when two tectonic plates move away from each other. Especially along mid-ocean ridges, where magma rises to form new seafloor, this process can indeed result in the formation of new crust. However, this new crust is balanced by the destruction of the old crust at subduction zones, where one plate moves beneath another and is reabsorbed into the mantle. As a result, the Earth is neither getting wider nor larger.during exhalation the diaphragm
A student cuts her hand during her gym class. The next day the cut is red and inflamed. What is the likely cause?
Answer:
D.) Immune response to bacterial toxins
Explanation:
The easiest and most effective way to prevent foodborne illnesses is to
Patients are listed in a patient register under a unique number, which makes up the:
What type of smoke screen provides a thick, vertical barrier between enemy and friendly troops?
The answer is a smoke curtain. It is a dense, vertical development of smoke. It is positioned between friendly and enemy positions to avert or damage enemy ground observation of friendly positions. Since the smoke curtain is not placed directly on friendly troops, it will not hinder friendly operations. Also, it activates in the event of a fire, on condition that a means of diverting smoke away from a preferred location or protecting an area from direct smoke infiltration.
While walking in a hallway, a client with a chest tube becomes confused and pulls the chest tube out. what is the nurse's immediate action?
________ is the term used to describe the crossing over of a tract to the side of the nervous system opposite to where the axons originated.
Short-term memory is transferred to long-term memory via a process called:
Why is it more important to check for errors during dna replication than during translation?
Answer:
an error in translation affects only one cell
Explanation:
Brown-eye genes are dominant over blue-eye genes. what is the best explanation for the fact that all the blue-eye alleles have not disappeared in the human population?
The outer layer of bone, composed of dense, irregular, collagenous connective tissue that contains blood vessel s and nerves is called
A client has a hiatal hernia. the client is 5 feet 3 inches tall (163 cm) and weighs 160 pounds (72.6 kg). which information should the nurse include when discussing prevention of esophageal reflux?
A change in allele frequencies in a population over a span of generations is
A change in allele frequencies in a population over a span of generations is called microevolution.
What is microevolution?
Microevolution is the change in allele frequencies that occurs within a population over time. This variation is the result of four distinct processes: mutation, selection, gene flow, and genetic drift. When compared to macroevolutionary changes, this change occurs in a relatively short period of time.
Pesticide resistance, herbicide resistance, and antibiotic resistance are all examples of natural selection at work. The enterococci bacteria depicted here have developed resistance to a variety of antibiotics.
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