If you have respiratory or heart problems, can make it worse.
a. carbon monoxide
b. oxygen
c. nitrogen
d. sulfur oxide
e. nitrogen oxide
(choose all that apply)
(its actually for earth science but thats not an option)

Substance a is a nonpolar liquid and has only dispersion forces among its constituent particles. substance b is also a nonpolar liquid and has about the same magnitude of dispersion forces among its constituent particles. when substance a and b are combined, they spontaneously mix.

Where are the noble gases located in the periodic table? a. in the center b. on the left side c. in the upper right corner d. on the far right side

How is it possible for someone to put an ear to a wall and hear someone in the next room?     a. sound waves can travel though solids.    b. the waves travel from room to room via air.    c. there must be some air in the wall so the sound can travel through it.    d. sound waves change to electromagnetic waves and then back again.