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Question
The characteristic found only in birds is:
The characteristic found only in birds is:
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Solution
The correct option is D Feathers
The presence of feathers is an external feature that distinguishes birds from other vertebrates. The feathers are produced from the skin which is loose and dry, without sweat glands and they form an insulating layer around the bird's body, helping to keep its temperature constant, and repelling water. The wings are specially developed for flight, having a large surface area and very little weight.Hence, option D is the correct answer.
The presence of feathers is an external feature that distinguishes birds from other vertebrates. The feathers are produced from the skin which is loose and dry, without sweat glands and they form an insulating layer around the bird's body, helping to keep its temperature constant, and repelling water. The wings are specially developed for flight, having a large surface area and very little weight.
Hence, option D is the correct answer.
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