What is common among a parrot,a platypus,and a kangaroo?

Identify the mismatched pair from the following:

Which of the following organisms possess the power of regeneration?

Find the odd one out.

Which of the following options represents the correct ascending order of complexity in animal body organization?

Assertion: All birds,except the ones like koel (cuckoo),build nests for retiring and taking rest during night time (day time for nocturnal).
Reason: Koel lays its eggs in the nests of tailor bird.