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Once a mammalian zygote has become a blastocyst and implants itself into the uterine wall, it will develop into?
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Correct Answer: A. Gastrula
The correct answer is A. The oocyte and morula are both precursors to the blastula stage. The embryoblast and the trophoblast are both components of the blastula, but are not the next stage in embryonic development. Once the blastula undergoes gastrulation, it will become a gastrula with three distinct layers of tissue: endoderm, mesoderm, and ectoderm.
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