Multiple Choice
Protruding papulae on the surface of echinoderms improve respiratory efficiency by ________.
A) decreasing the distance for diffusion
B) increasing the surface area for diffusion
C) increasing the concentration difference
D) changing the diffusion constant
Correct Answer:

Verified
Correct Answer:
Verified
Q39: Humans cannot survive long at altitudes greater
Q40: Fish and crustaceans are similar in that
Q41: Major evolutionary changes have resulted in anatomical
Q42: Tom is choking on a piece of
Q43: Soft-shelled turtles can remain submerged underwater for
Q45: What respiratory adaptation was important for the
Q46: Where a given species of vertebrate lives
Q47: What is the order of structures or
Q48: The large number of alveoli in lungs
Q49: Every winter,many individuals tragically die in their