Describe two processes through which rare alleles might become more frequent in a population

Inbreeding: inbreeding brings out more recessive alleles in a population, as they are more exposed and then eventually become more common.

Isolation: if a group of a species becomes isolated from another group of the species, these individuals mate with eachother and as the population of the isolated species grows, the recessive alleles will show.

It is is by digestion of complex molecules into simpler forms lke carbohydrates into its corresponding monosacchrides Glucose.Proteins to amino acids, Lipids to fatty acids and nuclec acids to nuclotides respectively.it is nothing but the metabolism of the complex macromolecules that we consume in the form of food.