20. Development
Animal Development
Multiple Choice
Multiple ChoiceOne difference between the blastula and gastrula stages of development is that __________.
A
blastula cells are more differentiated than gastrula cells
B
there are many more cells in a blastula
C
the blastula consists of more cell layers
D
the blastula is a solid ball of cells, but the gastrula is hollow
E
there is an opening from the cavity inside the gastrula to the outside
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