The vertebrae in birds are mostly

Procoelous

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Heterocoelous

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Amphicoelous

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Acoelous

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Solution

The correct option is B Heterocoelous
Heterocoelous vertebrae are characteristic of birds neck. The centrum is saddle-shaped. It permits extensive lateral and vertical flexion motion without stretching the nerve cord too extensively or wringing it about its long axis providing high flexibility to the neck movement.
Therefore, the correct answer is option B.

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