Answer:
(a) In comparison to poriferans, coelenterates have more developed body design differentiation. Poriferans have pores all over their body surface, while coelenterates do not have.
Porifera | Coelenterate |
Animals have less developed body design. These have pores all over their body. | Coelenterates have more developed body design. These do not have pores all over their body. |
Birds | Reptiles |
These have four-cham-bered heart. These have feathers. | These have three-cham-bered heart. These do not have feathers. |
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