On which of the following facts does the method of periodic abstinence is based?

Biology · Class 12 · CBSEReproductive Health

On which of the following facts does the method of periodic abstinence is based?
  1. Ovulation occurs on about the 14th day of menstruation.
  2. Ovum remains alive for about 1–2 days.
  3. Sperms survive for about 3 days.
  4. All of these

Answer

(D) All of these

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