10. What would happen if oxygen were not available?
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Without oxygen, aerobic organisms, including humans, would struggle to survive as our cells rely on oxygen for efficient energy production through cellular respiration. This would lead to a massive decline in populations of animals and humans, as we would have to depend on anaerobic organisms which generate energy less effectively. Decomposition would also slow down, leading to a buildup of organic matter since the processes require oxygen. In the grand ecosystem, plants and phytoplankton would also face a crisis. They not only contribute oxygen through photosynthesis but also depend on it for respiration at night. The resultant chaos would mean a drastic shift in the balance of life on Earth, likely favoring anaerobic bacteria and resulting in a very different world, replete with swamps and overgrown algae instead of lush forests.
