Natural Selection & Evolution

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What is natural selection?

Back

Natural selection is the process by which organisms better adapted to their environment tend to survive and produce more offspring.

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What does variation in a species refer to?

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Variation refers to the differences in physical traits among individuals of the same species.

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What is a common ancestor?

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A common ancestor is an ancestral species from which two or more species have evolved.

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How does the fossil record support the theory of evolution?

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The fossil record shows a chronological sequence of life forms, indicating that older species gave rise to more recent species.

Front

What is the significance of embryonic similarities among different species?

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Embryonic similarities suggest a distant common ancestor among different species.

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What is adaptation?

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Adaptation is a trait that helps an organism survive and reproduce in its environment.

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What role does competition play in natural selection?

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Competition for resources leads to survival of the fittest, where only the best-adapted individuals survive.

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What is the difference between artificial selection and natural selection?

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Artificial selection is the intentional breeding of organisms for desired traits, while natural selection occurs without human intervention.

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What is speciation?

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Speciation is the process by which new species arise from existing species.

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What is the impact of environmental changes on species?

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Environmental changes can lead to adaptations, migrations, or extinctions of species.