What is the Primary Distinction Between Protostomes and Deuterostomes

Question

What is the primary distinction between protostomes and deuterostomes?
A) fate of the blastopore
B) complexity
C) habitat-terrestrial or aquatic
D) symmetry
E) mesoderm-presence or absence

Accepted Answer

The primary distinction between protostomes and deuterostomes is the fate of the blastopore during embryonic development. In protostomes, the blastopore becomes the mouth, while in deuterostomes, it becomes the anus.