Is this reaction endothermic or exothermic?
2Na2O2(s) + 2H2O(l) → 4NaOH(s) + O2(g) + 126...
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Embryos of different species look very similar, which shows that the organisms share a ancestor.
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According to the diagram, what sources contribute to the phosphorus found in soil? according to the diagram, phosphorus found in soil contributes phosphorus to what other sources?
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