Q:

Which of the following time intervals best describes the resistant period?

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Which of the following time intervals best describes the resistant period?


  1. Week 1
  2. Weeks 3–8
  3. Weeks 9–38

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A. Week 1 is the resistant period when the conceptus demonstrates the “all-or-none” phe-nomenon (i.e., the conceptus will either die as a result of the teratogen or survive unaffected).

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