Answer:
In my opinion, if you feel that using a double mask will make you feel safer, then you should use it, but using a mask is important. Now, if you are already fully vaccinated I don't think you should use a mask unless you want to, which is totally fine.
Explanation:
The answers are to and from respectively.
A, to be sure if the chemical is hazardous or not so they know how to correctly dispose of it
Answer:
With chemicals and atoms.
Explanation:
Atoms gooood and chemicals the good kind (medicine).
