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Germinal period--Day 1 fertilization usually occurs within 24 hours of ovulation
Days 8-14 the blast cyst becomes fully embedded in the wall of the uterus and has about 250 cells
Embryonic Period:
Week 3-now an embryo, 3 layers emerge ectoderm, mesoderm, and endoderm
Week 8- many structures and organs are present. Ovaries and testes are evident; embryo begins to appear more human-like.
Fetal Period-
Week 9- bone tissue emerges and embryo becomes a fetus; head is large compared to rest of body (50%); can open and close mouth and turn head.
3. Teratogen-any disease, drug or environmental agents that can harm a developing fetus...
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