Which part of human being grows at the rate of about half-an-inch per month?

Correct option is A

The correct answer is (a) Hair.
Human hair grows at an average rate of about half an inch (1.25 cm) per month. This growth rate can vary depending on factors like age, genetics, health, and environmental conditions, but generally, hair grows at this consistent pace.
1. Hair Growth:
· Hair follicles are responsible for the production and growth of hair. On average, the scalp hair grows about 0.5 inches per month, which equates to approximately 6 inches per year.
· Factors such as nutrition, hormones, and stress levels can influence the growth rate of hair.
2. Other Parts:
· Large intestine : The large intestine is part of the digestive system and does not grow continuously after reaching maturity.
· Small intestine : Similar to the large intestine, the small intestine does not grow continuously.
· Ear : The ears do not grow at a measurable rate like hair, though some parts of the ear, like the cartilage, may change slightly with age.