| (i) Hollow bones to reduce body mass. |
| (ii) Feathers covering their body. |
| (iii) A streamlined body with powerful tail. |
| (iv) Wings with powerful muscles. |
A) (i) only
B) (i), (ii) and (iii) only
C) (i), (ii) and (iv) only
D) (i), (ii), (iii) and (iv)
Correct Answer: C
Solution :
Birds have streamlined body and a tail to change direction while flying but they do not have powerful tail as this will add to their weight and hinder flying.
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