Chapter 30 Quiz

How do protostomes differ from deuterostomes?

Protostomes undergo spiral cleavage during development.

The lining of the digestive tube is formed from:

endoderm.

Because it is an enclosed compartment of fluid under pressure, the coelom can serve as a_____, which shapes the body of soft animals.

hydrostatic skeleton

A marine invertebrate placed into freshwater would have difficulty surviving because:

it would have difficulty with osmoregulation.

Discuss the evolution of the coelom and pseudocoelom. What advantages do coelomate animals have over acoelomates?

-

The first land animals likely moved onto land how long ago?

450 million years ago

A true coelom develops within the ectoderm.

False

What is the key characteristic that defines the Ecdysozoa clade?

The animal molts.

Which statement about echinoderms is FALSE? -They show evidence of segmentation. -They fall within the group Bilateria. -The fall on the eumetazoan branch of animals. -They develop as deuterostomes. -They fall within the group Deuterostomia.

They show evidence of segmentation.

The common ancestor of all animals is/are the:

choanoflagellates.