Natural selection is the main mechanism by which evolution occurs. Finches and polar bears are adapted to their environmental conditions as a result of this mechanism.
Natural selection is the process by which certain organisms can survive and reproduce, while others do not.
The evolution by natural selection states that organisms better adapted to their environments have more chances to survive and reproduce, thereby they also have more chances to pass their genes to the next generation.
For example, the beak size of finches and the thick fur of polar bears are adaptations likely developed by natural selection, which allowed these organisms to survive in their environments.
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