Biology
Biology, 29.03.2021 22:00, koss929

How does pregnancy begin? A. A placenta forms in the uterus.
B. Contractions begin in the uterine wall.
C. A sperm reaches an egg in the fallopian tube.
D. The blastocyst differentiates into two cell types.

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How does pregnancy begin? A. A placenta forms in the uterus.
B. Contractions begin in the ute...

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