Practice!

Sample Problem

Which of the following characteristics fall within the Phlyum Platyhelminthes?

(A) triploblastic

(B) diploblastic

(C) circulatory system

(D) gastrovascular cavity

Solution

Both (A) and (D) are correct. Flatworms are triploblastic, and made of three germ layers, not two; flatworms have a gastrovascular cavity but lack a circulatory system.