Which of the following is not a way that humus affects the properties of soil?
a. humus expands with increased moisture levels.
b. humus increases the movement of water and air in soil.
c. humus decreases the porosity of soil.
d. humus acts as the basis for soil life.

letter C

Explanation:

answer; /// i believe the correct answer is (reactants);

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.