Answer:
Sperm cells fertilise with egg during sexual intercourse
Step-by-step explanation:
Sperm comes out of the p.enis and go up into the vagina and if one of the sperm connects with an egg, the two may combine to make a baby. The embryo is formed and makes its way to the uterus, where it will grow for the next nine months (or more) until the baby is ready to be born and comes out from the female vagina.