moving up the animal evolution trail, the first phylum with three germ layers is?

moving up the animal evolution trail, the first phylum with three germ layers is?

a. cnidaria
b. platyhelminthes
c. annelida
d. arthropoda
e. nematoda

the family tree fashioned from fossil research for animals shows a continuing trend toward ?
a. increase in body size and complexity
b. added levels or oganization
c. cell ability to interact as part of tissues
d. three germ layers
e. all of these

the first group to exhibit an amniotic egg with its several characteristic membranes was the?
a. aves
b. amphibia
c. reptilia
d. osteichthyes
e. mammalia

birds differ from earlier, similar vertebrate forms by?
a. their lack of scales
b. producing land eggs
c. endothermic temperature regulation
d. fertilize eggs internally
e. a dorsal nerve cord