Which Is True of the Amount of C in Our

question 113

Multiple Choice

Which is true of the amount of C in our atmosphere?

• A) C is the most abundant gas in the atmosphere.
• B) The level of C has been decreasing at the rate of 3.1% per year since 2000.
• C) The level of C increased at the rate of 1.1% per year from 1990 to 1999.
• D) The level of C has been much higher during the past 800,000 years than it is now.

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