Which of the below substances is a radioactive gas caused by the decay of uranium?
Radon
Mercury
Carbon Monoxide
Lead
Ultraviolet (UV) Rays

Radon

Explanation:

I'm not entirely sure, but from my studies:

Radon gas is a type of substance that can cause lung cancer. It is colorless and odorless. It mostly spreads outdoors rapidly.

Hope this helped! I am trying very hard to learn English, so if you can't understand than I am sorry.

just be there for her.

explanation:

not necessarily literally but figuratively. also don't say things like "i understand how you feel", because even though you are trying to , you clearly don't understand how she feels (i'm gonna go out on a limb here and assume you've never had a heart attack). also just let her rest. that is one of the best things for you to do.