During sexual intercourse, the man's ____ releases ____ into the woman's ____. Sperm cells travel from the penis and to the top of the vagina. They enter the uterus through the ____ and travel to the ____If a sperm cell meets with an ____ ____ there, fertilisation can happen. Fertilisation happens when an egg cell and sperm cell ____. The fertilised egg divides to form a ball of cells called an ____ and attaches to the lining of the ____. This is called ____. The embryo begins to develop into a ____.

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