C, because alleles are alternative forms of a gene that arise from mutation.
A semipermeable membrane is a type of biological or synthetic, polymeric membrane that will allow certain molecules or ions to pass through it by diffusion—or occasionally by more specialized processes of facilitated diffusion, passive transport or active transport.
The small intestines have microvilli in the lining which help to increase the surface area of the small intestines and help to absorb nutrients.
C.there is no relationship between metabolic rate and body temperature.
