While observing seawater through a microscope, you spot the embryo of an unknown animal. Which of the following criteria could you use to determine whether the organism exhibits protostome or deuterostome development?
A) the development of germ layers
B) spiral cleavage or radial cleavage
C) the development of a blastopore
D) the development of an archenteron

Question

Quizplus · Accepted Answer

Spiral cleavage is characteristic of protostomes, while radial cleavage is characteristic of deuterostomes. This distinction in the pattern of cell division during early embryonic development is a key criterion for differentiating between the two groups.

While Observing Seawater Through a Microscope, You Spot the Embryo