Examlex
Why does DNA evidence counter the assumption that races exist as distinct biological entities?
Alveoli
Tiny air sacs in the lungs where the exchange of oxygen and carbon dioxide takes place, crucial for respiratory function in mammals.
Elasticity
The ability of a material or body to resume its normal shape after being stretched or compressed.
Parabronchi
Minute tubular air passages within the lungs of birds through which respiratory gas exchange occurs, part of their highly efficient respiratory system.
Birds
Warm-blooded vertebrates characterized by feathers, beaks without teeth, and laying hard-shelled eggs.
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