Question

Which
of
following is not an
echinoderm?
Sea cucumber
Sea lemon
Sea lily
Sea biscuit​

Answer 1

Explanation:

Sea lilies are crinoids which in their adult forms are attached to the sea bottom.They belong to the group of Echinoderms.

Oreaster is most common starfish found in sea. It is commonly called sea pentagon and is an echinoderm.

Sea cucumber are echinoderms from the class Holothuroidea.

Sea pens are colonial marine cnidarians belonging to the order Pennatulacea. They have multiple polyps. They have eight tentacles.

Thus, the correct answer is option C