Examlex
The sodium-potassium pump is an example of an active transport mechanism.
Stratosphere
The stratosphere is a layer of the Earth's atmosphere located above the troposphere, characterized by a slight temperature increase with altitude and the presence of the ozone layer.
Ozone
A molecule composed of three oxygen atoms, found in the Earth's stratosphere, where it plays a critical role in protecting living organisms from ultraviolet radiation.
Lichen
A symbiotic organism composed of a fungus and a photosynthetic partner, typically an alga or cyanobacterium, found on rocks, trees, and soil.
Mutualistic Relationship
A type of symbiotic relationship where both organisms involved benefit from their interaction.
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