Principle #1 Genetic Variation : The gray furred raccoons have thick fur to help them stay warm in this winter weather. The white furred raccoons have thin fur so they struggle to survive compared to the gray raccoons.
Principle #2 Overproduction and the struggle for existence : they produce all year but not a lot make it due to the weather. Struggle for survival : the gray raccoons have a higher fitness because they have thick fur.
Principal #3 Differential survival and reproduction : the white raccoons start to die out because they can not survive the cold weather.
Principal #4 Changes in gene pool : In the end the gray raccoons will start to reproduce more and more until there is more of them to continue reproducing.