Identify the features unique to protostome development.
A. Coelom forms by a splitting of the mesoderm, the blastopore becomes the anus, and the cleavage is spiral.
B. Coelom forms by a splitting of the mesoderm, the blastopore becomes the mouth, and the cleavage is spiral.
C. Coelom forms by a splitting of the mesoderm, the blastopore becomes the mouth, and the cleavage is radial.
D. None of the features listed are unique to the protostomes.
Answer: B
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