1) Carbon atoms are released as CO2 during - a) respiration b) photosynthesis c) DNA replication 2) Capture carbon dioxide from the air and use it to make organic compounds such as glucose - a) Autotrophs b) Heterotrophs c) Consumers d) Animals 3) Burning fossil fuels, like oil or coal, releases -  a) oxygen b) carbon dioxide c) amino acids d) nucleic acids

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