The answer to this question is D: Psychoactive. It is the world's most widely consumed psychoactive drug.
Lichens and algae I believe
The immediate lack of oxygen.
Answer:
Explanation: First off, people with CO often receive supportive care to relieve symptoms. The FDA has approved of some other tactics such as a medical D to treat CO patients. Secondly, the equipment used on people with CO is often a mask and a respirator. Hope this helps.