Imagine that you have four food dyes to test ,A, B,C and D. Imagine that you are going to investigate which food dye diffuses most quickly. a- which variable will you change?

answer: c.

explanation:

if the temperature drops and becomes cool

then the atmosphere can be freezing as the water vapor in the air is at maximum (100%) and can be severely cold

also can be snowing lightly as the moisture in the air will start to solidify

and btw this is not chemistry but