By which of the following circumstances is animal welfare most threatened? O disagreements among advocates for animal rights and animal welfare
O the high demand for animal products
the expense of animal welfare measures
lack of public interest in animal rights or animal welfare

not sure if this is what you'r looking for eubacteria and archaebacteria

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.