In sea stars,the __________ surface is the upper surface of the animal and contains the madreporite.
A)aboral
B)oral
C)madreporite
D)anal
E)rigid

Question

Quizplus · Accepted Answer

The aboral surface is the upper surface of a sea star and contains the madreporite, which is an opening that allows water to enter the water vascular system. The oral surface is the lower surface of the sea star and contains the mouth. The term "madreporite" refers specifically to the opening itself, not a surface. The anal surface is located at the opposite end of the body from the madreporite and is where waste is expelled. "Rigid" is not a surface term and is not specific to sea stars.

In Sea Stars,the __________ Surface Is the Upper Surface of the Animal