Examlex
The retrograde portion of a planet's motion has what duration?
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.
Countercurrent Exchange
A mechanism in which fluids flow in opposite directions, exchanging properties (such as heat or chemical constituents) to maximize transfer rates.
Gills
Respiratory organs in certain aquatic organisms, allowing them to extract oxygen from water.
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