Step-by-step explanation:
That is because if they did not have their amino acids in different orders, they would not be “different” polypeptides — all polypeptides with their amino acids in “the same order” are by definition copies of exactly the same polypeptide and The different amino acids have different shapes and properties. Different orders of amino acids create differently shaped proteins (their secondary structure). Some are hydrophilic (attracted to water) and some hydrophobic (repel water). That makes them stick to different things