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What increasingly characterized commerce in the 1920s?
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.
Gases
Substances that are in the state of matter characterized by having neither a defined volume nor shape, expanding to fill their container.
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