The dark, outer layer of a mollusk shell is referred to as the

What structure is compared to a cat’s tongue in texture?

A system of canals through which seawater is circulated that is unique to Echinoderms is called

________ act(s) as kidneys and remove liquid waste from mollusks.

Phylum Enchinodermata is more advanced than Phylum Mollusca?

Of the phyla we have discussed to this point, which one has the most complex nervous system?

Regeneration of lost parts of a sea star also serves in 

Echinoderms are monecious with external fertilization.

The 180°, counterclockwise twisting of the visceral mass, mantle, and mantle cavity of gastropods is called

Sea cucumbers will eviscerate intestines if disturbed.