$O_{2}$ exchange with $C O_{2}$ by simple diffusion over the entire body surface takes place in:
I. Sponges II. Coelenterates III. Flatworms
Select the correct option to complete the given statement.

I and II

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II and III

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I and III

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All of the above

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Solution

The correct option is D All of the above
Mechanism of breathing varies among the different groups of animals depending mainly on their habitats and level of organization. Lower invertebrates like sponges, coelenterates, flatworms, etc., exchange of $O_{2}$ with $C O_{2}$ by simple diffusion over their entire body surface.

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