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k0ka [10]
3 years ago
12

What might cause oxygen levels to drop?

Biology
2 answers:
katen-ka-za [31]3 years ago
6 0
Some of the most common causes of hypoxemia include: Heart conditions, including heart defects. Lung conditions such as asthma, emphysema, and bronchitis. Locations of high altitudes, where oxygen in the air is lower
statuscvo [17]3 years ago
6 0

Answer:

Because tree are gone

Explanation:

Trees died and there no more

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