Archebacteria are known as extremophiles. which one of the following justifies this statement? archebacteria can prepare their food using photosynthesis unlike eubacteria. archebacteria can cause extremely severe diseases in humans, unlike eubacteria. archebacteria can survive in extreme conditions, including without sunlight and oxygen, unlike the eubacteria.

"d.) carbon dioxide and hydrogen sulfide"

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.