Examlex
The cell membrane is a rigid structure that provides bacteria with their characteristic shapes.
Spiracles
Small openings on the surface of some animals, especially insects, which lead to the respiratory system, allowing for gas exchange.
Ventilation
The process of actively moving air or water over a respiratory surface.
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.
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Q64: Rigid bacteria with a helical cell shape