The evolutionary mechanism of gene flow A. separates the gene pools of two or more groups, typically causing the development of a new species.
B. reduces the gene pools of two or more groups, typically causing the extinction of an existing species.
C. combines the gene pools of two or more groups, typically causing the species' change in allelic frequency.
D. destroys the gene pools of two or more groups, typically causing the extinction of an existing species.

bradykinin is a physiologically and pharmacologically active peptide of the kinin group of proteins, consisting of nine amino acids.

a = executive branch; b = judicial branch

it provides an alternative energy pathway for the reaction to proceed.

a catalyst is a substance that speeds up the rate of a chemical reaction but is not consumed during the course of the reaction.

catalysts increase the rate of reaction without being used up. they do this by lowering the activation energy needed. with a catalyst, more collisions result in a reaction, so the rate of reaction increases. different reactions need different catalysts.

a catalyst works by providing an alternative reaction pathway to the reaction product. the rate of the reaction is increased as this alternative route has a lower activation energy than the reaction route not mediated by the catalyst.