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a molecule that accelerates (speeds up) a chemical reaction, by lowering its activation energy, without being changed by the reaction.
the process whereby a particular change causes a response which reverses that change.
compounds that consist of any combination of elements, but do not usually contain carbon and...
when the body makes its own antibodies when deliberately exposed to a dead or weakened pathogen...
a leaf with certain areas that lack chlorophyll. The leaf therefore contains both green and non-...