Steps of enzyme activity in order from first to last

This part insulates the reaction chamber from the transfer of heat to or from the surrounding environment

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?

Will camels hump ahrinks. give reason