Besides mammals, placenta like structure also occurs in

Plathyelminthes

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Amphibians

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Bony fishes

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Cartilaginous fishes

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Solution

The correct option is C Cartilaginous fishes
Two kinds of placenta-like structures are found in Cartilaginous Fishes - Finger like projections (trophonemata) and yolk sac placenta. These structures closely resemble and even satisfy the definition of the placenta.
No such strong evidence of placenta-like structures is found in Amphibians, Bony fishes or Platyhelminthes.
So the correct answer is 'Cartilaginous fishes'.

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