Question

Why is breathing considered a sure sign of life...answer in detail and in a 10 th class standard

Answer 1

when we are alive our heart beats and we breath. the heart pumps and the impure blood comes from heart to lungs and goes back. and we breathe. but when we die the heart stops beating and the blood doesn't come to lungs and we don't breathe. that's why, breathing is considered as a sure sign of life.

Answer 2

BECAUSE IT SHOWS THAT OUR RBC REQUIRES OXYGEN AND IT IS ONLY POSSIBLE WHEN WE ARE ALIVE