A classic example of biochemical evidence for evolution is the variance of the ubiquitous (i.e. all living organisms have it, because it performs very basic life functions) protein Cytochrome c in living cells.Many higher order organisms possess a chain of 104 amino acids.
A technique used to determine relationships is to study the biochemical. similarity of organisms. Though molds, aardvarks and humans appear to have little in. common physically, a study of their proteins reveals certain similarities.
