They speed up reactions by lowering activation energy. Many enzymes change shape when substrates bind.
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Primary pollutants are emitted from natural or anthropogenic sources directly into the atmosphere, while secondary pollutants result from the chemical reactions or the physical interactions between the primary pollutants themselves or between the primary pollutants and other atmospheric components.
Answer:
no, Charon is significantly smaller than Mercury
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2) some fake skin stuff is made to practice sticthces, tattoos, or injections
i dont really know the rest sorry
