The common name for Sabella is

Cnidarians possess a ____________ skeleton.  

Phylulm Platyhelminthes is the first phyla to encompass the levels of organization from cells to organ system.

What is the term for the internal cavity of a sea sponge?

Turbellarians feed on rotifers, which are

What structure contains the mouth in Turbellarians?

The __________ is the simplest, but least common body form of sponge. 

It is estimated that there are ________________ species of sea sponges.

There are approximately _________ species in Phylum Platyhelminthes.

In class Turbellaria, these animals have endodermal germ tissues that gives rise to the