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.