In examining an unknown animal species during its embryonic development, how can you be sure what you are looking at exhibits protostome or deuterostome development?
A) There is evidence of cephalization.
B) The animal is triploblastic.
C) The animal is clearly bilaterally symmetrical.
D) The animal's coelom develops from the archenteron.

Question

Quizplus · Accepted Answer

The key difference between protostomes and deuterostomes is how their coelom (body cavity) develops. In deuterostomes, the coelom develops from the archenteron (the primitive gut), which is a characteristic not seen in protostomes. This feature is a definitive way to distinguish between the two types of development during the embryonic stage.

In Examining an Unknown Animal Species During Its Embryonic Development