1. The number of cells in three separate Petri Dishes was recorded over a period of 20 days. The data shown in the table best illustrates which part of the cell theory? 1)All living things are made up of cells.
2)Cells are the basic unit of living things.
3)Organisms can be single celled or many celled.
4)All cells come from preexisting cells.

what subject is this

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.