Carbon Dioxide or Carbon Oxygen 2?

Carbon Dioxide or Carbon Oxygen 2? once the required oxygen or carbon dioxide conten Carbon dioxide 1.The plants can ___ carbon dioxide into oxygen. 作业是英文的,xxx+oxygen=carbon dioxide+xxx carbon-dioxide complex是什么意思 carbon dioxide是什么意思 Carbon dioxide concentration(ppmv) why are trees important (参考词语,take in carbon dioxide,oxygen, sequester carbon dioxide from atmosphere carbon what is the capacity of carbon dioxide?