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14 May, 00:50

What is the first step of pregnancy?

A. Differentiation of blastocyst

B. Contraction of a uterus

C. Development of placenta

D. Formation of a zygote

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Answers (1)
  1. 14 May, 01:18
    0
    D. Formation of a zygote

    Explanation:

    The formation of a zygote happens within the first 24 hours of a pregnancy.
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