The germ layer that gives rise to the outer covering of the animal body and the nervous system is the:

Protostomes develop by:

All apicomplexans are nonmotile, spore forming, and parasitic.

The germ layer that gives rise to the animal digestive tube and digestive organs is called:

The coelomates are the least evolved bilaterally symmetrical animals.

Earthworms show all of the following features except

Which of the following statements about hydra is false?

Molecular data confirm that cnidarians branched off from the rest of animals before ________ evolved.

Sponges are protected by _____________________________.

Collar cells are a characteristic of: