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B
Brain of earthworm
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C
Heart of rabbit
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D
Brain of rabbit
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Solution
The correct option is C Brain of rabbit The ventricles are the features of the mammalian brain. These are the cavities in the brain as well as the spinal cord that is filled with the cerebrospinal fluid. These are lined with the choroid plexus made up of tela choroidea, blood vessels and the ependymal cells. The third ventricle is present in the diencephalon wherein, the epithalamus forms the roof, the two halves of the thalami form the lateral walls and the hypothalamus forms the floor. Rabbit is a mammal, so its brain will have the third ventricle.