The biochemical code for eye color is transmitted from parents to offspring by

A) neurotransmitters.
B) natural selection.
C) epigenetic molecules.
D) genes.

Biochemical Code

The complex sequences of biochemical signals and processes that govern the functioning of living organisms.

Eye Color

The color of the iris, determined by genetics, which can range from blue, green, brown, to variations of these colors.

Genes

Units of heredity made up of DNA that influence the development of an organism's traits and are passed from parents to offspring.