What Event Marks the End of the Period of the Zygote

question 64

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.

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