The variety and variability of organisms is called Choose... . One of the benefits of this kind of variety includes ecosystem Choose... , which is the ability of an ecosystem system to recover after a disturbance. Other benefits of healthy ecosystems include ecosystem Choose... such as pollinating crops, regulating pests, and maintaining soil structure.

this is a good question! i'll do some research and come back when i have the answer!

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.

whats the drop down answers ?

explanation: