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brilliants [131]
3 years ago
12

when observing a runner-what physical evidence is there to suggest that the circulatory and respiratory systems rates are both i

ncreasing?
Biology
1 answer:
Fed [463]3 years ago
4 0

Answer:

Explanation:

The physical evidence that suggest an increase in both respiratory and circulatory rate of a runner is that his/her heart beat ( pulse) iinreases significantly and the runner breathes heavily in other to let in more air into his/her body.

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Commensalism is a situation in nature where there is an association between two organisms that benefits one but does not help nor harm the other.

Let's go through each example in order to find one with commensalism.

A). Honey bees that feed on the pollen of cornflowers and help the flowers reproduce. 

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B). Barnacles ride on a gray whale's back to obtain food, and the whale is not harmed.

This is a form of commensalism. The barnacles benefit from riding on the whale's back as they obtain food. The whale is also unharmed in the process.

C). Squirrels and chipmunks eat the same nuts in a forest where food is scarce.

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D). Prairie dogs often collect and eat food in groups so they are better protected from enemies.

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The best example of commensalism is B.
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