Examlex
The time is 9 pm and the Moon is setting in the west. The Moon phase is third quarter.
Tracheal Tubes
Air-conducting tubes in the respiratory systems of some invertebrates, notably insects, facilitating gas exchange.
Opercula
Flap-like structures in certain animals, such as fish, that cover and protect the gills, or the lid covering the opening of a snail's shell.
Alveoli
Tiny air sacs in the lungs where the exchange of oxygen and carbon dioxide takes place.
Countercurrent Exchange
A mechanism where fluids flow in opposite directions in adjacent channels, maximizing transfer rates of heat, gases, or other substances.
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