Redwood trees (Sequoia sempervirens) have more biomass than any other plant species in western redwood forests. They greatly impact the other plant and animal species that live in these forests. If removed, most understory plants and their associated herbivores could not survive. Are redwood trees keystone species?

The correct answer is - yes Redwoods are keystone species.

Explanation:

Redwood forests are for the great example pf the keystone species in California and other western Redwood forests. This is on the grounds that they house many bird species that can conceivably go extinct if the Giant redwood and the coast redwood become extinct.  

They sequester atmospherical carbon, assist clean with watering and give territory to species like spotted owls and jeopardized marbled murrelets.

Thus, the correct answer is - yes Redwoods are keystone species.

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.