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)

Three cards with holes are arranged in a straight line. a light is shined through the first card’s hole and travels through all three cards. what does this tell you about light rays? a) that light is reflected b) that light is refractive c) that light travels in a straight line d) that light does not travel in a straight line

Skills of homo sapiens were found an excavation. the skulls were preserved because the bodies were frozen. so, these fossils are (blank) fossils.the image shows the evolution of skulls beginning 2 to 3 million years ago. based on the image, modern human skulls(blank) ape skulls.

What is the vapor pressure of a solution with a benzene to octane?