In examining an unknown animal species during its embryonic development, how can you be sure what you are looking at is a protostome and not a deuterostome?
A) There is a well- developed coelom.
B) The mouth develops first, and the anus develops later.
C) There is evidence of cephalization.
D) The animal is triploblastic.
E) The animal is clearly bilaterally symmetrical.

Question

Quizplus · Accepted Answer

In protostomes, the mouth develops first in the embryonic development, whereas in deuterostomes, the anus develops first.

In Examining an Unknown Animal Species During Its Embryonic Development