The respiratory tree of a sea cucumber is
A)not present in other echinoderms.
B)branches off the cloaca of the animal.
C)also serving in excretion.
D)not a replacement for gas exchange through the skin and tube feet.
E)All of the choices are correct.

Question

Quizplus · Accepted Answer

The respiratory tree of a sea cucumber is unique to this group within the echinoderms, branches off from the cloaca, serves in both respiration and excretion, and does not replace gas exchange through the skin and tube feet, which also occurs in these animals.

The Respiratory Tree of a Sea Cucumber Is