When a polymer is broken

In which of the following relationships is one organism always benefited while the other organism is always harmed

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?

Which type of landform forms at the plate boundary as a result of divergent stress