Which route of entry could chemicals use to enter through the body’s airways?

Through; Inhalation for most chemicals in the form of vapors, gases, mist etc.

assuming you are in the home page.

1) go to the upper right hand corner

2) click on your "profile picture"

3) go down to "edit profile"

4) it should be titled as "edit your profile", click on "profile picture"

5) choose a file

6) press "change"

you're profile picture is updated

~