Which of these correctly describes the average length of pregnancy?
a. 38 weeks
b. 9 lunar months
c. 280 days from the last day of the last menstrual period
d. 280 days from the first day of the last menstrual period
ANS: D
The average length of pregnancy is 280 days from the first day of the last menstrual period, which is equal to 40 weeks, 10 lunar months, or roughly 9 calendar months.
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