Why is a high-carbohydrate, moderate-protein diet like the ornish diet often very difficult for a person to follow?

is this for the e2020 class

i believe it is c: genes for body color and wing size are inherited separately from each parent.

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.