3.Which of the following statements about CO2 is NOT true?
CO2 is just one type of greenhouse gas.
CO2 is harmful to the planet.
Life as we know it could not exist without CO2.
The CO2 in our atmosphere has been around a long time.
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2nd . co2 is harmful to the planet may be
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1)false
2) false
3)true
4)true
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