A) Forelimbs modified into wings
B) Bipedal vertebrate
C) Homoiothermal
D) Exoskeleton of feathers
Correct Answer: D
Solution :
The exoskeleton is epidermal and horny represented by (i) feathers forming a non conducting body covering for warmth (ii) scales on the legs (iii) daws on the toes (iv) sheaths on the beaks.
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