Select the correct statement.

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(C) $1$. Divergent evolution occurs when organisms with a common ancestor evolve different traits,leading to homologous structures. Thus,option $A$ is

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Thorns of Bougainvillea and tendrils of Cucurbita are homologous structures.

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(C) $1$. Divergent evolution occurs when organisms with a common ancestor evolve different traits,leading to homologous structures. Thus,option $A$ is incorrect.$2$. Australian marsupials and placental mammals show convergent evolution,as they evolved independently to adapt to similar environments. Thus,option $B$ is incorrect.$3$. Thorns of $Bougainvillea$ and tendrils of $Cucurbita$ are examples of homologous structures because they both arise from the axillary bud,indicating a common origin despite different functions. Thus,option $C$ is correct.$4$. Sweet potato (a root modification) and potato (a stem modification) are analogous structures because they perform the same function (storage of food) but have different origins. Thus,option $D$ is incorrect.

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