Homologous and Analogous Structures

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What are homologous structures?

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Structures in different species that are similar due to shared ancestry, even if they have different functions.

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What are analogous structures?

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Structures in different species that serve similar functions but evolved independently, not from a common ancestor.

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What does it mean if embryos of different species look similar?

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It suggests that these species may have evolved from a common ancestor.

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What is an example of homologous structures?

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The forelimbs of humans, whales, and bats, which have different functions but similar bone structures.

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What is an example of analogous structures?

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The wings of butterflies and birds, which serve the same function of flying but evolved independently.

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What is the significance of fossil evidence in understanding evolution?

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Fossils can show similarities in anatomy between extinct and modern species, indicating a common ancestor.

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What does the term 'common ancestor' refer to?

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A species from which two or more different species have evolved.

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How does evolution occur according to the theory of evolution?

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Evolution occurs gradually over long periods of time through processes like natural selection.

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What is the difference between convergent and divergent evolution?

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Convergent evolution is when unrelated species develop similar traits, while divergent evolution is when related species develop different traits.

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What is the role of natural selection in evolution?

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