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What is DNA?

                       DNA , or deoxyribonucleic acid, is the hereditary material in humans and almost all other organisms. Nearly every ...
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What is a cell?

                                      Cells are the basic building blocks of all living things. The human body is composed of trillions ...
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Ecological problems

                                T he Earth is the only planet in the solar system where there is life. If you look down at the Earth from...
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