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How was oxygen added to the atmosphere?

Answer 1

Caleb Allen

By producers (photosynthesis)

Producers (plants) produce oxygen following the well-known process known as photosynthesis:

#6CO_2 + 6H_2O -> 6O_2 + C_6H_12O_6#

Plants provide oxygen when there is an abundance of water and they are healthy (a sunny, daytime environment).

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Answer 2

Caleb Allen

Oxygen was added to the Earth's atmosphere through a process called photosynthesis, which began around 2.4 billion years ago. This process involved early photosynthetic organisms, such as cyanobacteria, using sunlight to convert carbon dioxide and water into glucose and oxygen. Over millions of years, as photosynthetic organisms proliferated and evolved, oxygen levels gradually increased in the atmosphere, eventually reaching the levels we see today.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.