The circulatory system of the frog.. A. carries oxygen to all of the cells
B. carries food to all cells
C. carries water to all cells
D. all of the above​

A

Explanation:

The blood carries oxygen and nutrients to cells and carries waste products away.

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.

segmented body, an exoskeleton made from chitin, and joint appendages.