Answer: variable
Explanation:
Any factor with more than one value
Answer:
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Italy is the modern country
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The correct answer is A. rainforests are responsible for most global oxygen turnover.
This is not true because rainforests, even though they have a lot of trees, are very humid, and actually take up a lot of oxygen to be able to 'feed' the vegetation found there. Other forests actually provide most oxygen in the world, but not rainforests. The other options are correct.