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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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Plants consume most of their carbon from a. the soil b. the water c. the roots d. the air
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For each of the formulas, classify the formula as either an empirical formula, a molecular formula, or both. nahco3 empirical molecular both
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