The madreporite the sea star select one:

a. reproduce.
b. locate food.
c. digest food and distribute it to the arms.
d. absorb water to regulate its vascular system.
e. keep its surface clean of algae and barnacles and deb

The correct answer is D.

Explanation:

The madreporite, which is present in the animals of echinoderm family including sea stars, sea cucumbers and sea urchins, is a part of the circulation system and an opening on the body of the animal that allows it to filter the sea water before taking it in to it's vascular system and control what goes in and out, sort of like a mouth.

I hope this answer helps.