Question

Name two invertebrate phyla, the members of which remain attached to the floor of the sea.​

Answer 1

Answer:

Echinoderms (Greek for spiny skin) is a phylum which contains only marine invertebrates. The adults are recognizable by their radial symmetry (usually five-point) and include starfish, sea urchins, sand dollars, and sea cucumbers, as well as the sea lilies.

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