An increase in food and a decrease in predators would most likely genetic variation in a population

IT is a change of frequency in a genes variant which is called genetic drift. this kind of scenario will result to smaller large population and larger small population :)

Six amino acids have side chains that are polar but not charged. these are serine (ser), threonine (thr), cysteine (cys), asparagine (asn), glutamine (gln), and tyrosine (tyr). these amino acids are usually found at the surface of proteins, as discussed in the proteins 2 module.