A)See whether the ectoderm forms the mature animal's skin/exoskeleton or nervous system.
B)See whether the animal exhibits spiral cleavage or radial cleavage during early development.
C)See whether the coelom is formed from a split in the mesoderm or from mesodermal pockets pinched off the gut.
D)See whether the pore formed during gastrulation becomes the mature animal's mouth or its anus.
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