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Sequence No.


Consider the following characters:
I. Wish bone furculum
II. Pneumatic bones
III. Feathers
IV. Endothermy
V. Left aortic arch
VI. Four chambered heart
Which of these are unique to birds?


(a) I, II and III only
(b) I, II, III and IV only
(c) I, II, III, IV and V only
(d) All


(a) I, II and III only

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