Which of the following statements about embryonic development is NOT true?
A. A zygote undergoes cleavage, which increases the cell number, but not the volume of the egg cytoplasm.
B. A primitive gut is also referred to as an archenteron.
C. A blastopore is the opening into the primitive gut formed by gastrulation.
D. A blastocoel is the fluid-filled cavity of a blastula.
E. The primitive streak occurs in the morula stage of the embryonic development.
Answer: E
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