Which two countries produce the most CO2?

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Explanation:

According to the most recent data from 2012 provided by the U.S. Energy Information Administration, the top five countries that produce the most CO2 are China, the United States, India, Russia and Japan. China is the largest emitter of carbon dioxide gas in the world with 8.1 billion metric tons in 2012.

1. dermis

2. chemical

3. urine

4. viruses

5. antibodies

the correct answer is b