if you mean it would be the only gass availibe (oxygen being cut off) then we would simply die
Unreliable is being not useful or dependable on something.
For example my phone is the absolute opposite of unreliable
It’s important to use DNA as evidence. If you don’t give consent it’s possible that criminal could get away. Or you might be the criminal! This is something that the police should be able to get a hold of without consent. (For investigation purposes only!!!!)
