Kidneys in adult frog are
(1) Pronephric
(2) Metanephric
(3) Mesonephric 
(4) All of these

answer is (3). Can you please explain how?

Dear student.

(3) Mesonephric is the correct answer.

Please refer the link below:

  • -3
Pronephros the most basic of the three excretory organs that develop in vertebrates, corresponding to the first stage of kidney development. It is succeeded by the mesonephros, which in fish and amphibians remains as the adult kidney. In amniotes the mesonephros is the embryonic kidney and a more complex metanephros acts as the adult kidney. Once a more advanced kidney forms, the previous version typically degenerates by apoptosis or becomes part of the male reproductive system.
so answer is 3rd

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