The outer cells of a blastocyst become the , an organ that offers protection and nourishment. Once the blastocyst has implanted in the uterus, it is called an . After eight more weeks of development, it is called a .

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Answer:

The outer cells of a blastocyst become the placenta, an organ that offers protection and nourishment. Once the blastocyst has implanted in the uterus, it is called an embryo. After eight more weeks of development, it is called a fetus.

Explanation:

Answer:placenta, embryo, fetus

Explanation:

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