1. which of the following is true for all the animals in the suborder pinnipedia
a. they have external ears
b. they come out on land to rest, breed and give birth
c. they have two large air pouches on sides of their neck
d. they walk on land
2. which of the following is a characteristic that sea otters stay warm in cold pacific waters?
a. a thick layer of fur
b. wrapping themselves in kelp
c. swimming fast to generate heat
d. a thick blubber layer