Question

Which group of animal exclusively free live in marine anilmal?

Answer 1

Cnidarians include corals, seaanemones, jellyfish and hydrozoans. They form a phylum containing over 10,000 species of animals foundexclusively in aquatic (mainly marine) environments.

Answer 2

The animal phylum which exclusively has free-living marine forms are called phylum Echinodermata.

The marine animals which come under phylum Echinodermata are:

Jellyfishes, hydrozoans, sea anemones,

All these phylum Echinodermata forms a phylum containing over 10000 species and they are only marine living animals, the list does not even include land animals!