A) present in all vertebrates
B) present in all chordates
C) absent in mammals
D) present in all mammals
Correct Answer: C
Solution :Renal portal system is well developed in fishes and amphibians, reduced in reptiles and birds and is absent in mammals. This system carried blood from the posterior region of body to the kidney by renal portal vein. Hepatic portal system is found in all chordates. Hypothalamo-hypophysial portal system is present in higher vertebrates (amphibians, reptiles, birds and mammals).
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