How many cell types do sea sponges possess?

__________ sponges have incurrent canals formed by infoldings of the body wall. 

Nematodes possess a __________ digestive plan.

Portuguese Man-O-War, are in reality, one large colony of polyps

Members of the Cnidarian class __________ never have a medusa stage. 

Which fluke has a smaller, thicker body?

The __________ cavity of Cnidarians serves in digestion and as a site for exchange of respiratory gases and wastes. 

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

The flat shape of Turbellarians help to increase surface area for diffusion.

Worms in class Monogenea infect