In the primary structure of a protein, amino acids are joined together by bonds.

In the primary structure of a protein, amino acids are joined together by peptide bonds otherwise called CO-NH bonds. Amino acids unite together and will form a peptide bond further it forms a polypeptide chain by combined with many peptides.

within 30 of the equator hope this

the correct answer is 4) heat and pressure

metamorphic rocks arise from transformation of existing rocks types, in a process called metamorphism. during metamorphism the original rock(prolith) change into metamorphic rock by heating (150-200c) and pressure of more than 1000 bar. the original rock can be sedimentary, igneous, or existing metamorphic rock.