When discussing expected changes in the female reproductive system to an older adult, the nurse should explain that:
a. increased pubic hair is expected
b. uterine enlargement is normal
c. vaginal tissues become more vascular
d. production of vaginal secretions decreases

i wish i could with all of them i can barley see the first one so here's the answer to the first one b

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.