Question

In birds, which organ is lacking?​

Answer 1

Explanation:

Organ Systems Adapted for Flight

Birds have light-weight bones that are filled with air. They also lack a jaw, which in many vertebrates is a dense, heavy bone with many teeth. Instead, birds have a light-weight keratin beak without teeth.

Answer 2

Answer:

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Birds have light-weight bones that are filled with air. They also lack a jaw, which in many vertebrates is a dense, heavy bone with many teeth. Instead, birds have a light-weight keratin beak without teeth

Explanation:

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