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Regarding the portal system, which combination is correct: does it connect one capillary network to another, is a renal portal system present in frogs but absent in humans, and is a hepatic portal system present in both mammals and frogs?

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1. Regarding the portal system, which combination is correct: does it connect one capillary network to another, is a renal portal system present in frogs but absent in humans, and is a hepatic portal system present in both mammals and frogs?

Only the capillary-network statement

All three statements together

Only the hepatic-portal statement

Only the renal-portal statement

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Regarding the portal system, which combination is correct: does it connect one capillary network to another, is a renal portal system present in frogs but absent in humans, and is a hepatic portal system present in both mammals and frogs?

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