__occurs when sperm fertilizes an egg cell
Menstruation
Conception
Ovulation
Labor
An egg cell and a sperm cell joined together if called a __
Zygote
Placenta
Blastocyst
Fetus
A week after fertilization, a blastocyst attaches to the lining of the__
Ovaries
Uterus
Fallopian tubes
Ovum
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