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Comparison of the branching air tubes in (a) an insect and (b) a mammal.

Comparison of the branching air tubes in (a) an insect and (b) a mammal.
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Description: Note the similar features of highly branching, internalized hollow tubules that connect to the outside air, suggesting that these systems perform similar functions.
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Source: https://biology-forums.com/index.php?action=gallery;sa=view;id=1072
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