Which of the following is true about birds? |
1. Birds bones are hollow. |
2. The wings of birds are attached to their breast bone. |
3. Strong muscles of birds help them to flap their wings. |
A) Only 1
B) 1 and 2
C) 2 and 3
D) 1, 2 and 3
E) None of these
Correct Answer: D
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