The difference between the two brothers is seven years. Why do they look different?

It is related to heredity and the body's absorption of nutrients. The two brothers are seven years apart. The difference in length is related to heredity and the absorption of nutrients by the body. When the body absorbs enough nutrients, the secretion of growth factors is normal, and the height will naturally be high. The absorption rate of the body is poor and the secretion of growth hormone is slow, so the height will be short. Brothers refer to brothers and younger brothers, who are closely related and have equal status.