Question

Circulation of blood in aquatic vertebrates differs from that in terrestrial vertebrates. Give reason.

Answer 1

Answer:

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The circulatory system varies from simple systems in invertebrates to more complex systems in vertebrates. The simplest animals, such as the sponges (Porifera) and rotifers (Rotifera), do not need a circulatory system because diffusion allows adequate exchange of water, nutrients, and waste, as well as dissolved gases.

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