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The table shows dates and appearance of index fossils. which rock layers can be dated most precisely? a) a layer containing both a fossil 4 and a fossil 3 b) a layer containing both a fossil 2 and a fossil 3 c) a layer containing both a fossil 1 and a fossil 4 d) a layer containing both a fossil 1 and a fossil 2
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Which is one example of a phenotypic change that is not genetic
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When a population split into two subgroups what is most likely to cause the subgroups to develop different traits?
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Which dna consist of a sugar, a phosphate, and a nitrogen containing base...
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