Reducing activation energy select one: a. is accomplished by the action of catalysts on reactants. b. requires higher temperatures than those found within cells. c. is a violation of the laws of nature. d. occurs only when reactants are quickly added to the reaction mixture.

A catalyst is something that lowers the activation energy; in biology it is an enzyme. The catalyst speeds up the rate of reaction without being consumed; it does not change the initial reactants or the end products.

Explanation:Hope it helps

aquifers are bounded above and below by impermeable rock. the driving force of groundwater movement in confined aquifers is pressure, rather than gravity.

b) nuclear ive learned that in a pedtrodic table