Explain two reasons why having an oxygen-rich atmosphere is important for life on earth?
Answers
quantumclaustrophobe
It's necessary for all animal-forms of life (including us), and it replaces the greenhouse gases in the atmosphere, allowing for a more temperate climate.
Joan H
Have you tried breathing any place where there is no oxygen?
Robin
the earth is not oxygen rich its only 21%
patrick
Longer life. Better for plants
Pope
Breathing and fire.
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