A) bone marrow, an ovary and hindlimb
B) bone marrow, pectoral girdle and forelimb
C) forelimb, an ovary and bone marrow
D) forelimb, pectoral girdle and pelvic girdle
Correct Answer: C
Solution :
In aves wings are modified forelimbs. Bones are pneumatic with air cavities and female possess only one ovary (left), bone marrow is absent, and all these absence in birds are helpful for flying nature.
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