For a sperm cell to fertilize an ovum, sexual intercourse must occur no more than __________ hours before ovulation.
A) 12
B) 24
C) 48
D) 72
E) 90
Answer: C
For a sperm cell to fertilize an ovum, sexual intercourse must occur no more than __________ hours before ovulation.
A) 12
B) 24
C) 48
D) 72
E) 90
Answer: C