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History, 05.07.2021 05:10 angelricardoblp8kwg3

Question 12 of 20 Select the best answer for the question
12. When did oxygen levels start to decline from 35 percent down to today's levels?
O A. During the Permian eriod
> O B. Before the Siluran period
C. After the Triassic period
Oo. Ater the Caroonferous period
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