Suppose a researcher wants to know whether a high protein diet causes children to learn better in school. half of the children in the study eat a high protein diet while the other half eats their normal diet. the control group consists of the:

the control group would be the children eating their normal diet

as many times as you want

multiple allele inheritance is traits controlled by more than 2 alleles (ex: pigeons having 3 alleles of one gene govern their feather color).   so the answer is a.