One job of the kidneys is to a. produce urea from amino groups and ammonia. b. destroy old red blood cells. c. regulate the ph of the blood. d. increase the salt vs. water balance in the blood.

Ineed ! i have no clue how to do this problem.

Which statement is true about a catalyst? a: a catalyst decreases the rate of the reaction. b. a catalyst is consumed during a chemical reaction. c. a catalyst lowers the activation energy of a reaction. d. a catalyst increases the reactant concentration during a reaction.

Carbon-14 undergoes radioactive decay in the reaction above. determine the type of radiation emitted in this reaction and describe what is happening to the nucleus during this reaction.