Nerve cells of animals in this phylum are considered by many biologists to be the most primitive nervous elements in the animal kingdom. 

The single large opening at the top of the spongocoel is the 

Hydroid jellyfish is a term for

What is the literal translation of Porifera?

An animal changing forms from one version to the next over the span of it’s lifecycle is referred to as

The life cycle of Trichinella is unusual for other nematode parasites in that

This group of animals does not possess embryological tissue layers. 

The __________ body form of a Cnidarian is typically asexual and sessile. 

Cnidarians have ___________ with cnidocytes.

Sponges can reproduce sexually because