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Grade 9 Science · Problem type
Homologous, analogous or vestigial?
Use this for “Which forelimb is not homologous to the others?”
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What does the structure show about ancestry?
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Assumptions
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Homologous structures have the same bones in the same order, inherited from a common ancestor, even when they do different jobs.
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Analogous structures do the same job but are built differently: they show no shared ancestry.
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Vestigial structures are small leftovers of parts an ancestor used.
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