<span>Proteins are composed of α-amino acids linked together by peptide bonds into polypeptide chains. An amino acid is characterized by an amino group (-NH2) and a carboxylic acid group (-COOH) linked to a carbon, known as the α-carbon. Also attached to the α-carbon is a H and various R-groups or "side-chains".</span>
A large genus of unicellular protists which have both plant & animal Characteristics.
Answer:
The major evolutionary changes was overtime Pakicetus had an earbone with a feature unique to whales and an ankle bone that linked it to artiodactyls.
The sun appears more ob earth
