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Biology, 23.05.2020 05:01 williamsa24mr238org

Which of these statements about the atmosphere is correct?
(Mark the one best answer.)
O A The amount of each gas in the atinosphere is fixed and cannot change.
OB The amounts of greenhouse gases in the atmosphere can change.
O C Most gases in the atmosphere are greenhouse gases,
OD Most gases in the atmosphere are required for animal life.

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Which of these statements about the atmosphere is correct?
(Mark the one best answer.)
O A...
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