Question

What advantage over an aquatic organism does a terrestrial organism have with regard to obtain o2 for respiration?

Answer 1

The amount of dissolved oxygen is water is comparatively less than that present in air.

This aquatic animals have more breathing rate.

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Answer 2

Around 21% of O2 is present in the atmosphere whereas only 0.03% dissolved O2 is found in water. This proves as an advantage to terrestial organisms as they have higher levels of oxygen present aorund them.