One way to determine if pollution is affecting the ecosystem is to look at the species called

Which are reasons cells undergo cell division?

In "the pig," what is the main effect that the piglet initially has on kibuka?

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?