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2 because the central nervous system includes the brain, cerebellum, cerebrum, brain stem, etc.
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Three of the four nitrogenous bases that make up RNA — adenine (A), cytosine (C), and guanine (G) — are also found in DNA. In RNA, however, a base called uracil (U) replaces thymine (T) as the complementary nucleotide to adenine (Figure 3).
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<span>An experiment that fails to prove a hypothesis will often provide a new direction for the researcher.
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