Which long-term consequence will take the most time to recover from?

Which layer will become saturated first when rain falls?

Vessels draining the myocardium of the heart, open primarily ,into which chamber?

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?