Final answer:
Evolution by natural selection is a fundamental concept in biology, illustrating how organisms adapt to their environments over time.
Explanation:
The theory of evolution by natural selection is a scientific concept that explains how organisms change over time through the process of natural selection. In natural selection, individuals with advantageous traits are more likely to survive and reproduce, passing on these traits to future generations. This leads to the adaptation of populations to their environments and the diversity of life on Earth.
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