<span> The chemical </span>components<span> of </span>DNA<span> are arranged into groups called </span>nucleotides<span>, each composed of a phosphate group, a deoxyribose sugar molecule, and any one of the four bases.
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<h3>Biologists study humans, plants, animals, and the environments in which they live. They may conduct their studies--human medical research, plant research, animal research, environmental system research--at the cellular level or the ecosystem level or anywhere in between.</h3>
