The most advanced kidneys in which loop of Henle is present are called metanephric kidneys,these are in all;except one

Amphibians

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Reptiles

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Birds

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Mammals

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Solution

The correct option is A Amphibians
Amphibians have mesonephric type of kidneys which are primitive compared to metanephric kidneys.
Mesonephric kidneys do not have nephrons but their nephrons do not contain a loop of Henle.
So, the correct option is 'Amphibians'.

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