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What happens during implantation?

The blastocyst attaches to the wall of the uterus.

Sperm are deposited into the vagina.

Sperm fertilize an egg.

The embryo is surrounded by the amniotic sac.

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Answer:

The blastocyst attaches to the wall of the uterus.

the blastocyst attaches to the wall of the uterus
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