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What was the percentage of oxygen in prehistoric times?

Chessrulz ∙

Lvl 1

∙ 15y ago

Updated: 9/16/2023

It was about 60% higher than the 21% that is today. This is a reason for large animals that are today smaller due to lower amounts of oxygen in the atmosphere. Living things usually grow faster in higher percentages of oxygen.

Wiki User

∙ 15y ago

What else can I help you with?

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