An example of homologous organs is

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(D) Homologous organs are those that have the same basic structural design and developmental origin but perform different functions.$A$. Our arm and a

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all of the above

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(D) Homologous organs are those that have the same basic structural design and developmental origin but perform different functions.$A$. Our arm and a dog's fore-leg are homologous as they share a similar skeletal structure.$B$. Potato tubers and runners of grass are homologous plant structures (modified stems).$C$. Our teeth and an elephant's tusks are also homologous as they are modified teeth.Since all the given examples represent organs with common ancestry and structural similarity,the correct answer is $D$.

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