Respuesta :
Answer: Option 'd' is correct.
Step-by-step explanation:
An internal environmental factor that affects heredity is Hormones.
Light and temperature are external environmental factor affecting heredity.
Nutrition is the process of obtaining the food required for health and growth.
Whereas Hormones are the chemical substance formed in the body that controls and regulates the activity of certain organs.
Hence, Option 'd' is correct.
