What is the best definition of remote sensing

Imagine ? person stepping on a pin and pulling his or her foot way look at the réfléchir arc of the scenarios below

With the word calcite wich completes the analogy mineral, erosion, marble, or aragonite

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).