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Biological Environment > Fertilization |
This site tells the story of the history of the universe. Click Earlier and Later to follow the story. Note: Many facts have been simplified to make them easier to understand. |
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In later cells two types of sex cells evolved. Some were small, could swim, but contained little food. These are called sperm. Other sex cells were large, carried food but could not swim. These are called eggs. The sperm swam to the egg. When a sperm enters an egg it is called fertilization. | |
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Biological Environment > Fertilization |
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