10. What mechanism is responsible for the obvious signs of an intoxicated person?
A) nerve cells are not functioning at all
B) cells are prevented from releasing hormones and enzymes
C) muscle cells have been blocked by dopamine
D) nerve cells are not effectively communicating with muscle cells

Ihave no idea how to solve these. plus there's another question that is 2) a 10 kilogram meteorite is collected in space and brought back to earth. it is composed of 1.25 kg of uranium-238 and 8.75 kg of lead-206. how many u-238 half lives have passed? what is the approximate age of the meteorite?