26. In general what is the
phase of the menstrual cycle
when copulation may lead to
fecundation?

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Although this is not rule, to be
effective in general must
occur about 24 hours after
(that occurs around the
day of the menstrual ).
Fecundation may occur even
copulation took place up 3 days
before ovulation the male gametes
remain for about 72 hours
the female reproductive system.

fertile period of the however
is considered the from 7 days
before to 7 days after
.