Answer:
The answer is "interaction between heredity and environment".
Explanation:
Heredity includes characteristics which are transmitted through genes from parents to their children. Where environment refers to our surroundings. All characteristics or traits depend both on heredity and environmental components. When Heredity and environment cooperate their effect is produced. This implies the manner in which genes act relies upon the environment in which they act. Similarly, the impacts of environment rely upon the genes with which they work.