A research group claims that they have discovered microscopic fossilized embryos, including some at the blastula stage, but other researchers are skeptical. Finally, one student develops a technique for splitting the embryos in half to reveal the substructure. Cutting open the first blastocyst embryo, the student is very excited. "It is a blastula!" she shouts,"Look, you can see the ________ inside!"

A. neural tube
B. granulosa cells
C. hollow blastocoel
D. archenteron


Answer: C

Biology & Microbiology

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