Click on the alignment to view it at a larger size. scan along the aligned sequences, letter by letter, noting any positions where the amino acids in the monkey or gibbon sequences do not match the human sequence?

8 amino acids

Explanation:

Amino acids are referred to as organic compounds containing carboxylic acid functional groups and amine. Amino acids contain different elements such as nitrogen, hydrogen, carbon and oxygen. Examples of amino acids are glycine,  glutamic acid and alanine. In the given alignment, there are 8 amino acids between the sequence of human and monkey.

petroleum? coal maybe?