It so many people produce the chemical, why doesn't everyone smell it? Explain ideas.

I really don't know.. here are my guesses though.

Explanation:

I think that maybe carbon dioxide is either:

a) A chemical that has no smell.

or

b) We are so used to the smell of it that we don't even smell it anymore. Like how you cant smell your own scent kind of.

you should wear a lead protective shield when having teeth x-rays

hope i

-lavira : )