When dwelling things need to have energy they just take in oxygen for respiration. The oxygen returns to the atmosphere in the form of carbon dioxide. These rocks had been at first in shallow seas, suggesting that oxygen from photosynthesis very first began to accumulate in maritime environments about half https://oxygenchambersfordogs31715.blogrelation.com/42194656/the-smart-trick-of-hyperbaric-oxygen-chamber-treatment-cost-that-nobody-is-discussing