The following questions are based on the description below.
A student encounters an animal embryo at the eight-cell stage. The four smaller cells that comprise one hemisphere of the embryo seem to be rotated 45 degrees and lie in the grooves between larger, underlying cells (spiral cleavage).
-Which of the following organisms are deuterostomes?
A)molluscs
B)annelids
C)echinoderms
D)chordates
E)both C and D

Question

Quizplus · Accepted Answer

Deuterostomes are characterized by radial cleavage, not spiral cleavage. Echinoderms and chordates are deuterostomes, while molluscs and annelids are protostomes, which exhibit spiral cleavage.

The Following Questions Are Based on the Description Below