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All the following statement are correct ...

All the following statement are correct about Aves but one is wrong which one is wrong ?

A

Fertilisation is internal

B

They are oviparous and development is direct, without exception

C

They are homeothermal animals with twelve pairs of cranial nerves

D

All the flightless birds have sternum with keel

Text Solution

Verified by Experts

The correct Answer is:
D
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