In this cladogram, which candy bars are most costly related

I’m doing some practice exam questions for biology, and i’m not sure how to do these 3 parts to the question.

What molecules will be best used to compare different species with the exact same sequence of amino acids? why would two species have the same protein even if the molecules in question is different? (hint: transcription to translation to protein).

Jane has a sprained ankle, and her doctor gave her a prescription that states: “ibuprofen caps 200 mg tid po.” what does this prescription say, in spelled-out form?