During the 1950's, several scientists were responsible for discovering the structure of dna. one scientist, erwin chargaff, found that in dna, the ratios of adenine (a) to thymine (t) and guanine (g) to cytosine (c) are always equal. which model best represents chargaff's rule?
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In a cladogram, what occurs at a node? a derived trait appears. evolution is stopped. an ancestor dies. the cladogram ends. aa as s as ss what are the chances that their offspring will have sickle cell anemia? 0% 25% 50% 100%
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Where is most of the fresh water on earth found a in the ocean b in glaciers and in ice caps c in rivers d in the soil
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Organ systems are composed of organs, organs are composed of tissues, and tissues are composed of cells. this pattern is organized into levels. organization based on levels can be found in what
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During the 1950's, several scientists were responsible for discovering the structure of dna. one sci...
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