Life is not possible without oxygen. Without oxygen, there is no life. Oxygen reaches our body only through breathing. Fresh air contains only 20{e94a9193ef36f921b9b544c077e72bc4a8fe147a0ed6c0df8cfe6f150d693bfd} of oxygen. By breathing fresh air, the amount of oxygen required by the body, the lungs can withdraw from the air. Respiratory needs to work wellContinue Reading