Question

______ marks the being of pregnancy.

Gamate Formation
Implantation
Fertilization
Menstruation ​

Answer 1

Answer:

Implantation. Once the embryo reaches the blastocyst stage, approximately five to six days after fertilization, it hatches out of its zona pellucida and begins the process of implantation in the uterus. In nature, 50 percent of all fertilized eggs are lost before a woman's missed menses.

Answer 2

Answer:

fertilization....

Explanation:

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