Answer:
An Oxygen molecule begins its journey by an bond between the two oxygen atoms. It comes with no color,odor or taste just like water. They play a very important role regarding the proper functioning of human body as it carries out several chemical reactions in our human body which aids in the digestion of food . It serves as a useful component for carrying out the respiratory activities. . It first gets inhaled from the atmospheric air to the lungs through nose by passing through several stages such as nostrils nasal passage pharynx larynx trachea .It helps in providing with the useful materials necessary and driving out harmful CO2 has. It also aids in circulation by combining with red pigment called Haemoglobin and makes an oxygenated compound called HbO2 and helps in the transport of gases carries out various chemical reactions and helps in the survival of human being.