PLZ HELP and best will get brainliest

Explanation:

do number one like that and do number two different

that is systems with essentially only two energy levels are

important kind of systems, as at low enough temperatures, only the two

lowest energy levels will be involved.

this would be a math

i think that is new experiments yield untrustworthy data and should be carefully considered, because you don't know what will happen with the experiments.