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2 years ago

Diffusion is a passive process that accounts for the movement of respiratory gases across the capillary membranes of alveoli.

Biology

1 answer:

strojnjashka [21]2 years ago

4 0

Answer:

True

Explanation:

Diffusion is a passive process (no energy required) in which the substance such as liquid and gases moves from an area of high concentration to an area of low concentration.

During respiration, carbon dioxide diffuses from the blood into the alveoli and oxygen diffuses from alveoli to blood across the respiratory membrane. The partial pressure of oxygen is low in the blood of the pulmonary capillaries and high in the alveoli. so diffusion allow movement of oxygen across the respiratory membrane from the alveoli into the blood.

Hence, the given statement is true.

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vekshin1

Answer:

Light, electric

Explanation:

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3 years ago

Climax communities occur before communities that are undergoing primary succession

slega [8]

Answer:

Answer is C. Climax community is an ecological community that has reached the final stage of ecological succession.

Explanation:

At this point bio-diversity is maximum and no further changes take place. It is the most stable period.

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3 years ago

Natural and artificial selection depend on genetic and phenotypic variation. In natural selection, the selective pressure comes

otez555 [7]

<h2>B) option is correct </h2>

Explanation:

Natural selection is a selection pressure which operates in a population and allow the best fitted genotype to survive in changing environmental conditions and eliminate the other genotype which are not fit

In artificial selection, breeders select superior breed for the breeding purpose so that this type of selection favors the superior genotype and eliminates inferior genotype, thus leading to genetic drift

Stabilizing selection is a type of natural selection in which intermediate genotype is favored but extreme genotypes (inferior and superior) are eliminated

In the given example of pigmentation in pigeons, breeding is selectively done with intermediate pigmentation hence intermediate genotypes will be favored

5 0

3 years ago

1. The Earth experiences days and nights due to the:

Flura [38]

C. Rotation on its axis

7 0

3 years ago

Explain how paleoclimatologists (scientists that study climate change) use fossils and other records to study climate change.

marysya [2.9K]

Answer:

paleoclimatologists use different sources of information from fossils in order to record past climate and environmental conditions (for example, tree rings or skeletons of coral reefs)

Explanation:

Paleoclimatology is the discipline that studies ancient climate and environmental conditions. Paleoclimatologists are researchers that analyze different sources of evidence to obtain accurate records of past climate conditions. In this regard, the fossil record has proven to be a useful tool to obtain such information. For example, the rings of fossilized trees are usually wider during warm and wet years, while these rings become thinner during cold and dry years. Moreover, geochemical records from the skeletons of fossil corals (composed of calcium carbonate) are good indicators of past climate conditions because coral growth is sensitive to small fluctuations in water temperature. Paleoclimatologists also use non-biological climate indicators (e.g., sediments and ice sheets) to reconstruct past climate and environmental conditions.

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2 years ago