At which developmental stage should one be able to first distinguish a protostome embryo from a deuterostome embryo?
A) fertilization
B) cleavage
C) gastrulation
D) coelom formation
E) metamorphosis

Question

Quizplus · Accepted Answer

During the cleavage stage, protostomes and deuterostomes can be distinguished by their patterns of cleavage; protostomes exhibit spiral and determinate cleavage, while deuterostomes exhibit radial and indeterminate cleavage.

At Which Developmental Stage Should One Be Able to First