3 years ago

Why are echinoderms more advanced than arthropods and mollusks?

1 answer:

mihalych1998 [28]3 years ago

4 0

They have internal skeletons which cover their skin. The body of an echinoderm seems little more than a skeleton of tiny plates and water. They don't use large muscles working on large body parts like many other animals. Instead they move, feed and breathe with a unique water-vascular system ending in hundreds of water-filled tube feet.

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