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Aboy with an extra x chromosome probably has which of the following syndromes?
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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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The cluster of developing cells from conception until birth is called an
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How would a harsh winter most likely affect the rabbit population size? population decreases popula...
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