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a molecule that accelerates (speeds up) a chemical reaction, by lowering its activation energy, without being changed by the reaction.
thin layer of living tissue between the xylem and the phloem, which is able to divide to make...
(also called an extinction event) the sudden dying out of large number of species over a short...
the factor that changes in an investigation and is not under the control of the investigator....
a foreign substance, usually a protein, that stimulates the production of one or more antibodies...