What characteristic defines this organism as eukaryotic a.

ability to move

c.

ability to repond

b.

presence of a nucleus

d.

irregular shape and size

b

Explanation:

its an organism consisting of cells in the form of chromosomes with a distinct nucleus.

d. planting trees

the trees take in carbon to make oxygen.

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.