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Elina [12.6K]
3 years ago
7

When did oxygen levels start to decline from 35 percent down to today’s levels

History
2 answers:
melomori [17]3 years ago
7 0

Answer:

100 percent

Explanation:

the oxgyn level todays level is 95

telo118 [61]3 years ago
7 0

The oxygen levels started to decline from 35 percent down to today’s levels in 1995.

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