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Large animals typically do not have tracheal tubes because their size requires a more efficient respiratory system to meet their oxygen demands. Tracheal systems, like those found in insects, are effective for small organisms but would be inadequate for large animals due to diffusion limitations over longer distances. Instead, large animals have evolved lungs and a circulatory system that enables efficient gas exchange and oxygen transport throughout their bodies. This adaptation allows them to support their metabolic needs effectively.

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1w ago

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