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12 cards from this deck
Approximately 200 million years
Almost 80%
Nitrogen (N2N_2N2)
About 20%
Crucial for respiration
Gases present in proportions of less than 1%
Water vapour (H2OH_2OH2O)
Carbon dioxide (CO2CO_2CO2)
Noble gases (e.g., argon)
Climate regulation
Maintaining the greenhouse effect
Remained relatively stable for 200 million years
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