Multiple Choice
What event marks the end of the period of the zygote?
A) The embryonic disk first appears.
B) The zygote divides for the first time.
C) The blastocyst is completely implanted in the uterine wall.
D) The sperm cell penetrates the ovum and the zona pellucida begins to thicken.
Correct Answer:
Verified
Correct Answer:
Verified
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