Answer:
A. volcanic eruptions
D. the clustering of continents near the poles
E. increased dust particles in Earth's atmosphere
Explanation:
Ice age is the name given to the period where thick layers of ice cover large areas of the earth. These periods can last thousands of years and dramatically change the characteristics of the planet. There have been some very significant ice ages in the history of the planet. In the late nineteenth century, much research showed that there were several ice ages that alternated with interglacial periods.
Many scientists believe that we will live a new ice age in 2050. This ice age, though expected shortly, will bring catastrophic results to the life we know. One certainty we have is that if this ice age occurs, it will be caused by human interference with nature and all the degradation that man has caused to the environment. In addition, this ice age is likely to be triggered by the factors likely to cause an ice age: volcanic eruptions, clustering of continents near the poles and increased dust particles in Earth's atmosphere
which component of human milk carries out phagocytosis of bacteria and production of complement proteins?
Which of these describes an ideal environment for bacterial growth?
Homo sapiens have 23 pairs of chromosomes. this implies that ________.
It implies that There are 46 chromosomes (dsDNA (double-stranded) molecules) are present in each somatic cell.
Homo sapiens has 46 chromosomes divided into 23 pairs: 22 pairs of autosomes and 1 pair of gonosomes or sex chromosomes, called X and Y. Male individuals have X and Y (XY) chromosomes. Female individuals have 2 X (XX) chromosomes.
Aneuploidy is an abnormal change in the number of chromosomes in a cell or organism (for example 45 or 47 chromosomes).
In addition to the chromosomes in the nucleus, human cells have DNA in the mitochondria (circular DNA).
The method in which some trees in an area of forest are cut while others are not is called _____. selective cutting pest management strip cropping clear cutting
selective cutting is the answer hope this helps you
How many amino acids are affected by a change in one nitrogen base?answer?
It changes one amino acid in the genetic code if a change in one nitrogen base occurs because one triplet codon is responsible to make one amino acid.
What is genetic code?DNA is the genetic material that stores information about the organism, this information is first converted into RNA by the process of transcription. After the transcription, this information is converted into the amino acid sequence.
Genetic code is the triplet sequence of a nitrogen base, which codes for the protein if any base is changed with another base, it will change the amino acid. Amino acid is made by triplet code, three bases are responsible for one amino acid.
Therefore, one amino acid is affected by a change in one nitrogen base, due to a triplet genetic codon.
Learn more about genetic code, here:
https://brainly.com/question/14059586
#SPJ5
Uncovered lightbulbs may expose food to which type of hazard ?
Answer:
Physical Hazard
Explanation:
An hazard is defined as something or a substance that by itself or due to its interaction or combination with another substance has the potential to cause harm.
We have 3 types of hazards.
a. Physical Hazard: This has to do with substances such as: uncovered light bulbs
b. Chemical Hazard: This has to do with chemical substances e.g. Acids, Bases, Pesticides, radioactive substances, e.t.c.
c. Biological Hazard: For example microorganisms such as Viruses, Bacteria and Fungi
Uncovered light bulbs may expose foods to physical hazard such as if the light bulbs get shattered , the presence of broken light bulb shards in food is very harmful.
What part of a neuron receives signals and sends a message to the cell body? what part of a neuron receives signals and sends a message to the cell body? axon terminal axon dendrite axon hillock?
The dendrite of a neuron receives signals and sends them to the cell body. The signals then move through the axon to the axon terminal, which transmits the signal to other neurons. The axon hillock is where the axon connects to the cell body and where signal transmission begins.
Explanation:The part of a neuron that receives signals and sends a message to the cell body is called the dendrite. Each neuron has many dendrites, which are designed to receive chemical signals from other neurons and transmit these signals to the cell body. The signals then move further down the neuron through the axon, reaching the axon terminal, which is responsible for transmitting the signal to the next neuron.
The axon hillock is also an important part of this process as it is the area where the axon connects to the cell body and where the initiation of signal transmission to other neurons begins.
Learn more about Neuron here:https://brainly.com/question/13079309
#SPJ6
Which statement correctly describes the bars on a bar graph representing the data?
The right answer is C.
A bar chart, also known as bar graph or column diagram, is a way to graphically represent a set of data or values, and is made up of rectangular bars of lengths proportional to the values represented. Bar graphs are used to compare two or more values. The bars can be oriented horizontally or vertically.
Since the value obtained at very low concentration (30) is twice the value obtained at average concentration (15), it can be deduced that "C" is a correct answer. The other answers are false.
A property of t cells, but not b cells, is their __________.
what shape would be the most desirable for larger cells?
Final answer:
The most desirable shape for larger cells is one that maximizes surface area to volume ratio for efficient exchange of nutrients and waste, often a sphere. Various cell shapes can also result from functional requirements or physical constraints influencing cellular function.
Explanation:
The most desirable shape for larger cells would be one that maximizes the surface area to volume ratio, to ensure efficient exchange of nutrients and waste. Cells that are too large may not be able to support the rate of diffusion required for their volume due to a decreased surface area-to-volume ratio. Spherical shapes tend to be the most efficient in terms of surface area-to-volume ratio because as the cell increases in size, a sphere's surface area increases as the square of its radius, while its volume increases as the cube of its radius.
Considering two cells, a spherical cell with a diameter of 5 µm would likely exchange nutrients and wastes more efficiently than a cubed-shaped cell with a side length of 7µm. The surface area-to-volume ratio for a sphere is higher than that of a cube, resulting in shorter distances for nutrients and wastes to travel to and from the cell's periphery, leading to faster molecular exchange rates.
Cell shapes can also be affected by physical forces and functional requirements. For example, red blood cells adopt a biconcave disc shape to optimize the exchange of oxygen, whereas nerve cells have long extensions to aid in signal transmission. Thus, while most cells approximate a sphere for efficiency, different shapes can arise from the cell's necessity to fulfill specific roles within an organism.
Behaviors that stem from innate, automatic behavioral tendencies that will occur reliably in all members of a species in response to some sort of cue from the environment, are called
How is the concentration of animal bones explained? (movie: surviving africa)?
Which conclusion best supported by the information?
Answer:
Option B
Explanation:
Both plants and animals can reproduce asexually, therefore option A is incorrect
Organisms that reproduce sexually have the advantage to produce genetically diverse offspring. Hence, option C is incorrect
Heterotrophs can reproduce both sexually and asexually, hence there is not no relation between being heterotroph and reproducing either asexually or sexually. Hence option D is also incorrect
If an organism reproduces asexually, then there is no pressure on it to select its mate. Hence, option B is correct
How is it possible for percolating groundwater to remove mineral material as well as deposit it?
Final answer:
Groundwater can both remove and deposit mineral material, depending on its flow and the surrounding materials.
Explanation:
Groundwater can both remove and deposit mineral material through various processes. When groundwater flows through porous materials like sand and gravel, it can erode and dissolve minerals, carrying them away. This is how groundwater can remove mineral material. On the other hand, when the flow of groundwater slows down or stops, the minerals it carries can precipitate out and get deposited in the pores or fissures of the surrounding materials. This is how groundwater can deposit mineral material.
In the desert food web shown below, which of the following best describes the transfer of energy between the desert tortoise and the coyote?
A) About 90 percent of the desert tortoise's energy transfers to the coyote.
B) About 10 percent of the coyote's energy transfers to the desert tortoise.
C) About 10 percent of the desert tortoise's energy transfers to the coyote.
D) About 90 percent of the coyote's energy transfers to the desert tortoise.
Answer:
C) About 10 percent of the desert tortoise's energy transfers to the coyote.
Explanation:
In the given food web, the coyote is the top consumer that feeds on desert tortoise and kangaroo rat. Only 10% of the energy of one trophic level is passed to the next trophic level and 90 % of the energy is lost in respiration.
Hence, only 10% energy of desert tortoise would be delivered to coyote and rest would be lost during respiration.
Name the valve (sphincter) located between the stomach and the duodenum
The "pyloric sphincter" which located between the stomach and the duodenum.
What is pyloric sphincter?The movement of food from the stomach into the esophagus is controlled by the pyloric sphincter at its base.
What is duodenum?The beginning of the small intestine would be the duodenum. The duodenum's primary function is to finish the first stage of digestion. Food first from the stomach has been combined with pancreatic enzymes and gallbladder bile in this area of the intestine. Bile as well as the enzymes aid in food digestion.
The smooth muscle ring known as the pyloric sphincter separates the small intestine from the stomach. It opens and shuts to regulate the movement of stomach juices as well as partially digested food first from the pylorus towards the duodenum.
Therefore, the "pyloric sphincter" which located between the stomach and the duodenum.
To know more about pyloric sphincter
https://brainly.com/question/15582646
#SPJ2
Differentiation of cells changes the nucleic information. True or false?
What does an ant use to keep all of its hair in place?
"where does the energy for the calvin cycle come from?"
Final answer:
The Calvin cycle uses ATP and NADPH, which contain energy from sunlight, to turn carbon dioxide into carbohydrates, such as glucose, for long-term energy storage.
Explanation:
The energy for the Calvin cycle is derived primarily from ATP and NADPH, which are compounds rich in chemical energy. These molecules are produced during the light-dependent reactions of photosynthesis.
The ATP and NADPH, carrying energy captured from sunlight, are utilized by the Calvin cycle to convert carbon dioxide into carbohydrate molecules, such as glucose, which serve as long-term energy storage for the cell. Specifically, the Calvin cycle harnesses the energy in the form of 6 ATP and 6 NADPH to produce Glyceraldehyde-3-phosphate (GA3P) molecules that will eventually form the backbone of carbon atoms for carbohydrates, primarily glucose. Thus, the Calvin cycle effectively converts the short-lived energy stored in ATP and NADPH into a more stable form of energy in carbohydrates, a process essential for life on Earth.
When the genotype consists of a dominant and a recessive allele, the phenotype will be like the:?
A bread whose texture is too dense was probably made from a dough containing too __________
_____ act on the cns to suppress or slow bodily processes and reduce overall responsiveness.
What do all living things need?
a. energy, water, sunshine, protection
b. food, water, air, a place to live
c. oxygen, outer covering, parents, vitamins
d. water, parents, a place to live, air
When assessing the chest of an adult female critical trauma patient, the emt should inspect/palpate for ___________ in addition to crepitations and deformities?
The blood vessel that brings blood to the kidney directly from the aorta is the __________.
3 reasons why determining cause of death can be difficult
Which of the following refers to changes in species characteristics over time?
evolution
interdependence
metabolism
reproduction
Evolution
.................................................
When you spin around, you lose balance because of fluid spinning around in the _____. A. cochlea B. tympanic membrane C. semicircular canals D. auricle
Answer: Semi circular canals.
Explanation: These are three fluid filled canals located in the inner ear that is helps us to maintain the balance.
When the head is moved around, the fluid moves the hair inside and these tiny hair sens the message to the nerve cell ( brain).
But when you move around the liquid keeps on sending the message to the brain that you are moving a bit longer and the body loses its balance.
All organisms require nitrogen to make amino acids, which in turn are used to build carbohydrates
Final answer:
Organisms require nitrogen to synthesize amino acids, the building blocks of proteins, not carbohydrates. Nitrogen fixation by microorganisms converts atmospheric nitrogen into forms usable by plants, which animals then consume, making it a critical component of the nitrogen cycle.
Explanation:
The original statement that all organisms require nitrogen to make amino acids, which in turn are used to build carbohydrates, contains an error. In fact, organisms use nitrogen to synthesize amino acids, which are the building blocks of proteins, rather than carbohydrates. Atmospheric nitrogen (N2), which makes up about 79% of Earth's atmosphere, cannot be utilized directly by most organisms. Through a process called nitrogen fixation, certain microorganisms convert atmospheric nitrogen into forms that plants can absorb, such as nitrate ions (NO3−) and ammonium ions (NH4+). Once assimilated by plants, these nitrogen compounds can be incorporated into amino acids and eventually proteins. Animals obtain their nitrogen by consuming plants or other animals. The cycling of nitrogen between the atmosphere, soil, plants, and animals is an integral part of the nitrogen cycle, which is crucial for life on Earth.
Which of these happens during the postabsorptive state?