Answer :
Answer:
Tolerance
Explanation:
The body gets used to stuffs I mean if you wake up and have to run a kilometer then first 10 days it will be very difficult to you but after consecutive ten days it will be easier to you to run a kilometer distance which means the body of the person is getting used to, to the external environment. This feature of the body is amazing and it works in the opposite direction as well. If the person starts smoking then at first they will smoke one or 2 cigarattes to counter the blood pressure movement. After some days, the person gets used to, to smoking. This amazing phenomenon of body is tolerance.