The figure below shows a planarian.Bilateral symmetry and a highly branched gastrovascular cavity all suggest that the planarian is a(n)______.
A) annelid
B) mollusk
C) chordate
D) flatworm

Question

The figure below shows a planarian.Bilateral symmetry and a highly branched gastrovascular cavity all suggest that the planarian is a(n)______. 
A) annelid 
B) mollusk 
C) chordate 
D) flatworm

Quizplus · Accepted Answer

Bilateral symmetry and a highly branched gastrovascular cavity are characteristic features of flatworms, making them the best choice for the given figure. Annelids have segmented bodies and mollusks have a distinct muscular foot and a mantle that secretes a calcareous shell. Chordates have a notochord, which is absent in planarians.

The Figure Below Shows a Planarian