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A device that assists respiration and can provide positive-pressure breathing is a(n) :
Keystone Species
A crucial species whose presence significantly influences the survival of other species in an ecosystem, and its removal would lead to significant changes in the ecosystem's structure.
Tropic Interactions
Ecological interactions that cause organisms to move or grow toward or away from stimuli, including phototropism, hydrotropism, and others.
Ecosystem Function
The collective biological, geochemical, and physical processes within an ecosystem, which support and regulate the flux of energy and matter.
Top-down Processes
Cognitive processes that are guided by higher-level mental processes, such as experience, expectations, and motivations.
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