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A computer needs software, information that tells it how to operate. A computer cannot work without software. Our bodies work like this too. Imagine the body is a computer. It needs an information code to work. DNA is this code.

The DNA code contains the instructions for living things to grow, work, and make copies. A baby is a copy. When parents have a baby, she shares about 50% of the DNA from each parent. Brothers and sisters share 50% of their DNA. But identical tw...

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