____ intercourse must happen for fertilisation to occur. ​ Sexual intercourse is when the man’s erect ____ is placed inside the woman’s ____ Eventually, ____ are released inside the woman’s vagina.​ The sperm’s job is to ____ up through the cervix into the ____. From there, the sperm enter the ____. Only the winning sperm enters the ​____.​ If an egg cell is present one of the sperm cells may enter the egg cell to ____ it.​ If a ____ is formed, it travels down the oviduct and out into the uterus where it attaches to the ____.​ When this happens, we say the woman is ____​. The fertilised egg divides and grows to form a bundle of cells called an ____.​ Embryos contain ____ of cells.

Human fertilisation

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