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olga2289 [7]
3 years ago
12

Question 12 of 20

History
1 answer:
geniusboy [140]3 years ago
6 0

Answer:

After the Carboniferous period

Explanation:

The oxygen levels start to decline from 35 percent down to today's levels "After the Carboniferous period." This is the period of about 298 million years ago after 60 million years of Carboniferous period which began around 358 million years ago. It was characterized by dense and swampy forests, which led to large deposits of peat.

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