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

The Oligochaeta worms have

Most adult tapeworms have repeating units called __________ in which each contain a full set of male and female reproductive organs.

In turbellarian nervous systems, neurons carrying information to the brain are __________ neurons.