Biology 0610 · IGCSE · Sex hormones in humans

Sex hormones in humans — practice question

A standard menstrual cycle lasts $28$ days, and day $1$ marks the beginning of menstruation. On which day is the lining of the uterus at its thickest?

  • A$1$
  • B$4$
  • C$9$
  • D$21$

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