Why doesn't the level of oxygen in the atmosphere decreases'?

Oxygen levels are decreasing globally due to fossil-fuel burning. The changesare too small to have an impact on human health, but are of interest to the study of climate change and carbon dioxide.

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brain development. a child's brain undergoes an amazing period of development from birth to three—producing more than a million neural connections each second. the development of the brain is influenced by many factors, including a child's relationships, experiences and environment.

explanation: