Choose all the answers that apply. Hydrocarbons .

are poisonous
combine with nitrogen oxide to create smog
are mostly caused by cars
are part of the carbon-oxygen cycle
form when fuel is not completely burned

HURRY PL

answer by yourhope:

how do models compare to real-world objects?

d. most models represent a real-world object in a simpler way.

: )

8 m/s because for him to get the same amount of energy as ray is putting out, bobby, who weighs half as much as ray, needs to run twice as fast.

i'm wiling to try and you : )

i think its 100.

hope this !