Evolution and Natural Selection

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What is evolution?

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Evolution is the process through which species change over time through variations and natural selection.

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What is natural selection?

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Natural selection is the mechanism by which individuals with favorable traits are more likely to survive and reproduce.

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What are homologous structures?

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Homologous structures are body parts in different species that have similar structures but may serve different functions, indicating a common ancestor.

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What are vestigial structures?

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Vestigial structures are body parts that have lost their original function through evolution, such as the human appendix.

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What is the fossil record?

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The fossil record is the collection of all known fossils, which provides evidence of past life and evolutionary history.

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What does 'descent with modification' mean?

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Descent with modification refers to the process by which descendants of a common ancestor accumulate differences over time.

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What is a common ancestor?

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A common ancestor is a species from which two or more different species have evolved.

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What is the significance of the Galápagos finches?

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The Galápagos finches illustrate adaptive radiation, where species evolve different traits based on their environment.

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What is a transitional fossil?

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Transitional fossils are remains of organisms that show intermediate traits between ancestral and derived species.

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What is genetic variation?

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Genetic variation refers to the differences in DNA among individuals within a population, which is essential for natural selection.