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High School Biology: Reproduction and Human Development - From Fertilization to Old Age (Fill in the blank)
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High School Biology: Reproduction and Human Development - From Fertilization to Old Age (Fill in the blank)
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8 Questions

1. The blastocyst reaches the uterus about ____________ days after fertilization.

2. In the zygote, half the ____________ come from the egg and half from the sperm.

3. Birth typically occurs at about ____________ weeks after fertilization.

4. Implantation is the process of embedding the blastocyst in the lining of the ____________.

5. ____________ is the period of transition between the beginning of puberty and adulthood.

6. The heart begins to beat about ____________ weeks after fertilization.

7. ____________ is the first year of life after birth.

8. The three distinct cell layers of the embryo are the ____________, mesoderm, and endoderm.

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