The long bones are hollow and connected by air passages. They are the characteristics of:
A
Reptilia
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B
Land vertebrates
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C
Aves
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D
Mammals
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Solution
The correct option is C Aves
Aves is a class of vertebrates that comprises the birds’ species. Birds possess lightweight bones that contain internal spaces filled with air. These are called pneumatic bones. They help in reducing their body weight thus, it is an adaptation for flight.