Which of the following mammals lacks a corpus | vedclass

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(D) The $corpus \ callosum$ is a thick band of nerve fibers that connects the two cerebral hemispheres in placental mammals $(Eutheria)$.$Ornithorhync

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Ornithorhynchus

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(D) The $corpus \ callosum$ is a thick band of nerve fibers that connects the two cerebral hemispheres in placental mammals $(Eutheria)$.$Ornithorhynchus$ (the platypus) belongs to the order $Monotremata$ (Prototheria),which are egg-laying mammals.Prototherians lack a $corpus \ callosum$ because they do not have the placental connection between the hemispheres found in higher mammals.Therefore,the correct option is $(d)$.

Which of the following mammals lacks a corpus callosum?

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