Distinguish between natural selection and artificial selection.

Natural selection is when favorable traits stay in a population while unfavorable traits get weaned out. EX: There is terrain that is lightly colored and there are some moths there. They need to blend into the terrain to not be eaten by birds. So, the lighter colored moths live longer and can produce more offspring than the darker colored moths. Now, what happens if the color of the terrain changes due to a factory being put right next to it and causing the terrain to turn grey. The lighter colored moths will be eaten more than the darker colored moths so then he darker colored moths will be reproducing more and most of the moths will be darker colored. 

Artificial selection: is the intentional breeding for certain traits, or combinations of traits, over others, and is synonymous with "Selective breeding". 
EX: the breading of certain dogs to produce the poodle. 

I hoped this helped! Have a fantastical day!!! XD

It allows water to resist freezing and thawing cycle.