What are the unique anatomical structures observed in birds to carry out the functions of digestion? Explain thoroughly these unique structures and provide reasons for the appearance of these unique structures. Please make sure to answer the question directly and correctly, especially those with bold text. Please don't copy and paste

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Tissue regeneration & repair

Tissue regeneration involves the restoration of tissue components by regrowth of damaged tissues. In contrast, tissue repair involves patching of injured tissue rather than restoring it. It is the proliferative capacity of the cells that decides the amount of regeneration against the repair that would occur in the tissue. Both regeneration and repair depending on the duration of the injury and response to the inflammation.