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.

Mollusk blood is referred to as

How many groups of mollusks branched off the original common ancestor?

For a sea star to regenerate from a severed arm what must still be in tact on that arm?

Sea urchins possess

Reproduction in aquatic molluscs is typically

The body of molluscs is divided into two main regions called the

Animals in this class are referred to as 5-“toothed” mouth.