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Natural selection is when organisms have to adapt to their environment in order to survive.
Principle #1 Genetic Variation: The different genetics among the species.
Principle #2 the struggle for existence/survive: Forest fires kill lots of animals.
Principal #3 differential survival & reproduction: The animals change location and repopulate.
Principal #4 changes in the gene pool: The brown and black bears reproduce offspring.
Conclusion: Now that the bears have relocated and repopulated they have a better chance at survival.