What is the key difference between protostomes and deuterostomes?
a. Protostomes are animals with soft exteriors and deuterostomes are animals with hard exteriors (i.e., shells).
b. Protostomes represent a lineage of bilaterally symmetrical animals, whereas deuterostomes represent a lineage of radially symmetrical animals.
c. The protostome gut develops from back to front and the second opening becomes the mouth. The deuterostome gut develops from front to back, so the first opening is the mouth.
d. The protostome gut develops from front to back, so the first opening is the mouth. The deuterostome gut develops back to front and the second opening becomes the mouth.
e. Protostomes represent animals that are prokaryotes, and deuterostomes represent all over animals.
Ans: d. The protostome gut develops from front to back, so the first opening is the mouth. The deuterostome gut develops back to front and the second opening becomes the mouth.
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