Sexual dimorphism is found in

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(A) Sexual dimorphism refers to the distinct morphological differences between males and females of the same species.In $Ascaris$ (roundworm),the sexe

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Ascaris

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(A) Sexual dimorphism refers to the distinct morphological differences between males and females of the same species.In $Ascaris$ (roundworm),the sexes are separate (dioecious),and the male is smaller than the female with a curved posterior end,exhibiting clear sexual dimorphism.$Amoeba$ is a unicellular organism that reproduces asexually,so it does not exhibit sexual dimorphism.$Pheretima$ (earthworm) is hermaphroditic (monoecious),meaning both male and female reproductive organs are present in the same individual,so it does not show sexual dimorphism.Therefore,the correct answer is $Ascaris$.

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