The correct sequence of preembryonic structures is ________
A) zygote, morula, blastocyst
B) morula, zygote, blastocyst
C) morula, blastocyst, zygote
D) zygote, blastocyst, morula
A
Explanation:
B) The morula stage is not the first stage in preembryonic structures.
C) The morula is not the first stage in preembryonic structures.
D) The blastocyst is not the second stage of preembryonic structures.
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