All of the following shows aerial adaptation in birds except
A
Gizzard
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B
Single ovary
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C
Pneumatic bone
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D
Keeled sternum
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Solution
The correct option is C Gizzard
Gizzard is the hind part of the stomach. In most of the birds, it is the modified stomach especially for grinding food. The gizzard has a thick muscular wall and may contain small stones, or gastroliths, that function in the mechanical breakdown of seeds and other foods.