After severe trauma, a bird develops difficulty in body support and movement. Which vertebrate system is primarily affected?
Internal skeletal framework
Body support and movement in vertebrates, including birds, are functions of the internal skeletal (bone) framework, which provides structural support and works with muscles to enable movement.
Trauma affecting support and movement therefore points to damage in the internal skeletal system, not the digestive, respiratory (gill), or isolated muscle systems alone.
Hence, this is the correct answer.
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