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B
Reptiles and cartilaginous fish
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C
Bony fish and mammals
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D
Amphibians; mammals, cartilaginous fish
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Solution
The correct option is D Amphibians; mammals, cartilaginous fish The excretion of urea is called ureotelism. Land animals, mainly amphibians mammals, convert ammonia into urea. These animals are called ureotelic. Urea is a less toxic compound than ammonia. Eg marine fishes, many amphibians etc.
So the correct option is "amphibian, mammals, cartilaginous fish".