What is common among Parrot, Platypus and Kangaroo ?

Toothless jaws

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Functional post and tail

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Oviparity

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Homoiotherny

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Solution

The correct option is C Homoiotherny
Only Kangaroos have teeth.
Platypus and Kangaroo have functional tails.
Kangaroo shows vivipary whereas Parrot and Platypus show Ovipary.
All birds and mammals show Homoiothermy or ability to regulate body temperature so Parrot, Platypus, and Kangaroo all have the ability to regulate body temperature.
So the correct answer is 'Homoiothermy'.

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