Answer:
oxygen from reaching your tissues and organs.
Explanation:
Carbon Monoxide is very dangerous to us and many other animals. It is a flamable gas that is bad for our blood cells. When we breath it in and it gets put into out blood, it cannot be used as a substitution for air, and you will suffocate.
...I think.
<span>Prokaryotes is the answer</span>
3 is the correct answer. Let me know if you want me to explain why that is the answer.