Answer:
most likely C
Explanation:
human skin has a variety of different tones and therefore is polygenic
also, free Jay pic cuz she da best
(C)rough because it cools so fast that air bubbles get trapped inside of the rock, and they will pop causing it to be rough
Hey You!
There are 5 stages of the sleep cycle, and each stage lasts about 5-15 minutes long (usually around 10-15, though).
And that's youd answer! ^