What is the predominant nitrogen-containing pollutant in the atmosphere?

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?

Evolution acts upon the population of organisms and not on each individual organism

The eyeball is wrapped in adipose tissue within the orbit. what is the function of the adipose tissue?