Final answer:
Natural Selection is a crucial mechanism in evolution, determining which traits are passed on through generations based on adaptation to the environment.
Explanation:
Natural Selection is a key mechanism of evolution, describing the process where individuals best adapted to their environment are more likely to survive and pass on their genes. For natural selection to occur, the population must have genetic variation and the trait in question must be heritable. This process explains the 'why' behind evolutionary changes over time.
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