Oxygen is the lifeline of a human being. It is the main catalyst for intracellular energy that is necessary to sustain human life. We inhale oxygen and exhale carbon dioxide. But have you ever thought that what would happen if the world lost the oxygen for just five seconds? What would we do? Would we just hold our breath for five seconds? And what would happen to the atmosphere? How will the loss of oxygen affect the environment? Okay! now take a deep breath to feel how satisfying it is before we tell you what would happen if the world lost oxygen for five seconds. The oxygen we breathe to live roughly makes up 21 per cent of our atmosphere with the 78 per cent being nitrogen and one per cent carbon dioxide and other gases. Although oxygen is not the most abundant gas in our atmosphere, it is the most important and not just for humans but for plants and other living beings as well. Without oxygen, plants, animals, water and we humans wouldn’t be alive. Though five...