Please help me need answer

In the terms of these substances, you need to remember the danger of the use, even if they are prescribed; they are actually most likely to be more dangerous. Also, do not overuse it, as in you should use the exact amount prescribed, there are risks of addiction, behavior change, and it can affect your r brain so you have to keep in mind that it's something you shouldn't play with.

"d.) carbon dioxide and hydrogen sulfide"

if you know your abc's you should be able to get your answer or just use google