Layer of vegetation elevated above the ground, usually of tree braches and epiphytes. In tropical forests, the canopy may be more than 100 feet above the ground.
An organism that satisfies its need for organic food molecules by using the energy of the sun, or of the oxidation of inorganic substances, to convert inorganic molecules into organic molecules. ...
The raising of benthic nutrients to the surface waters. This occurs in regions where the flow of water brings currents of differing temperatures together, and increases productivity of the ecosystem.
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