Genetic Drift
Genetic drift is a random process where the frequency of certain traits in a population changes over time just by chance. Not to be confused with natural selection. Natural selection is intentional and not by chance. 
Natural Selection
Survival of the "Good Enough" vs Survival of the Fittest Natural selection is depicted as survival of the fittest, however, this implies that only the fastest, strongest, and most superior reproductive systems will carry on their genes/survive. For example in this boxing match Mr. "Fittest" would always win, this is not the case in natural selection. The term "fittest" can be misleading and depict bad odds for the "good enough" organisms. The "good enough" organism just has to be better than the organisms around them and survive long enough to reproduce. For example if a tiger were to chase after these organisms the good enough organisms just has to out run another organism or hide better than another organism. See picture below. Mr. "Good Enough" survived and survived many for occasion identical to this one and was able to reproduce and pass on his "good enough" genes.
I love how clear your explanations were! On your very first image I find it interesting that the fire did not change what colors were available, just the frequencies of each color, as now there are more orange than grey.
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