Above, deoxyribonucleic acid was explained. If you are to clone organisms, you have to copy their DNA. This can be a very complicated process, especially if it is a mammal you are trying to clone. First people have to take a donor cell from the animal they are cloning. Second they take a firtelized egg cell from another one of the animals they are cloning, and take out the nucleus of the egg. They then fuse the donor cell to the egg cell. Finally they put the cell back into the animal the egg came from. The cell will then start multiplying itself until the cloned animal is ready to be born.
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