Which is the best example of water regulating an organism’s body temperature?

a jogger sweating after a run

a fish passing water over its gills

a deer taking a drink from a stream

a leaf using water for photosynthesis

A jogger sweating after a run is the best example of water regulating an organism’s body temperature.

Explanation:

When a human being drinks water, the water content increases in the body. After the exercise, the water flows out of the body in the form of sweat and the body cools down as the temperature of body decreases.

That is the amount of excess water content in the body decreases or moves out of the body. Hence, in this manner the body temperature regulates.

A fish breathes with the help of his gills. When the fish gulps water through its mouth it passes through the gills. The oxygen in the water molecules gets absorbed by the gills and moves in the blood stream.

Therefore, the heart distributes oxygen in the body and carbon dioxide is moved from the body to the water. Hence, it does not affect the temperature of the fish.

Whereas a deer taking a drink from a stream is actually drinking to satisfy his thirst. This will again do not have any effect on deer's body temperature.

A leaf using water for photosynthesis will help in the preparation of food for the plant. There will be no effect of water regulation on the plant's body temperature.

Thus, we can conclude that option (a) is the correct answer.

the answer would be c