You find what you believe is a new species of animal. Which of the following characteristics would enable you to argue that it is more closely related to a flatworm (Phylum Platyhelminthes) than it is to a roundworm (Phylum Nematoda)?

A. The embryo is triploblastic.
B. It is shaped like a worm.
C. It has bilateral symmetry.
D. It has no coelom.
E. It has a mouth and an anus.