Which of the following represents a heterogeneous phenotype:
A.) Aa
B.) AA
C.) aa
D.) Ab

in a chemical reaction, the atoms and molecules produced by the reaction are called products. no new atoms are created, and no atoms are destroyed. in a chemical reaction, reactants contact each other, bonds between atoms in the reactants are broken, and atoms rearrange and form new bonds to make the products.

i think the answer is a.keratin is the pigment responsible for skin color.

answer; motor (efferent)neurons;