a fertilised egg divides into a ball of cell and becomes attached to the lining of the uterus. explain why it is important that this ball of cells soon becomes attached to the lining of the uterus.
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Fertilisation happens when an egg cell meets with a sperm cell and joins with it. The fertilised egg divides to form a ball of cells called an embryo. The embryo attaches to the lining of the uterus. It begins to develop into a fetus and finally into a baby.
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