What evidence is most consistent with dinosaurs becoming extinct at the end of the cretaceous era?

Describe the iron sulfide hypothesis and the lipid membrane hypothesis.

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?

Development has provided electrically for less money but what may be considered a cause of nuclear power