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Question-1 Which is true?
1) Feathers are insulators of heat in birds.
2) Feathers are exoskeleton in birds.
3) Feathers are endoskeleton in birds.
4) Feathers are conductors of heat in birds.

(A) 1 and 2

(B)2 and 4
(C)2 only
(D)3 only




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