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).
-What is characteristic of all ecdysozoans?
A)the deuterostome condition
B)some kind of exoskeleton, or hard outer covering
C)a pseudocoelom
D)agile, speedy, and powerful locomotion
E)the diploblastic condition

Question

Quizplus · Accepted Answer

All ecdysozoans have some kind of exoskeleton or hard outer covering, such as the cuticle of insects or the shell of crustaceans. This characteristic sets them apart from other animal groups. The given description of the animal embryo does not provide enough information to determine its phylum, but it does mention spiral cleavage, which is a characteristic of some ecdysozoans. However, spiral cleavage is not exclusive to this group and can also be seen in some deuterostomes. The other answer choices do not apply to ecdysozoans.

The Following Questions Are Based on the Description Below