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Lesson 20.3: Pregnancy | Check Your Understanding
The _____ secrete(s) the hormone progesterone, which maintains the endometrium.
A. villi
B. sinuses
C. placenta
D. umbilical cord
True or false?
Chemicals such as alcohol, nicotine, and drugs can pass from the mother to the developing baby through the placenta.
A. True
B. False
Critical Thinking.
Why is implantation in the endometrium critical for the embryo’s survival?
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