Segmentation is thought to have evolved three times,twice in protostomes and once in deuterstomes as seen in the
A)echinoderms.
B)nematodes.
C)flatworms.
D)mollusks.
E)chordates.

Question

Quizplus · Accepted Answer

Segmentation is thought to have evolved three times, once in deuterostomes (seen in chordates) and twice in protostomes (not seen in echinoderms, nematodes, or mollusks). Flatworms do not have segmented bodies.

Segmentation Is Thought to Have Evolved Three Times,twice in Protostomes