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Photosynthesis
The process by which green plants and some other organisms use sunlight to synthesize foods with the help of chlorophyll.
Cellular Respiration
The metabolic process by which cells obtain energy from glucose and produce carbon dioxide and water.
Ecosystem
A biological community of interacting organisms and their physical environment.
Biodiversity
The variety of life in the world or in a particular habitat or ecosystem.
Habitat
The natural home or environment of an organism, providing food, water, and shelter.