What flight adaptations arise in the structure of the skeleton of birds?

1) There have been changes in the belts of the front and hind limbs, the forelimbs have changed into wings.
2) A keel has appeared that promotes flight.
3) The jaw apparatus was transformed into a beak.
4) A very mobile cervical spine.
5) The presence of lightweight bones with air cavities.
6) Lack of teeth.

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