| http://www.w3.org/ns/prov#value | - water ??? ??? ??? pH scale measures hydrogen ion concentration of a solution ??? ??? ??? metabolism the sum of all the chemical reactions taking place in living cells ??? ??? ??? enzymes organic catalysts that speed up chemical reactions without being used up in the process. composed mostly of proteins ??? ??? ??? catalysts speed up chemical reactions without being used up in the process. lower th
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