When you are faced with a dangerous or threatening situation, your adrenal glands release stress hormones such as adrenaline into the bloodstream. Subsequently, there are increases in your blood pressure, heart rate, respiration, and perspiration. This reaction is known as the

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?