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B
Reptiles
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C
Birds
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D
Both A and B
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Solution
The correct option is C Birds A renal portal system is a portal venous system. It's function is to move blood from the renal glomeruli to the peritubular plexus that surround the proximal and distal convoluted tubules. Renal portal system is present in amphibians and reptiles, reduced in birds and absent in mammals.