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AP Biology Unit 8

TermDefinition
Biotic factor Living component of an ecosystem
Abiotic factor Non-living component of an ecosystem; ex: amount of light, temperature
Biomass The total mass of organic matter comprising a group of organisms in a particular habitat
Biodiversity The variety of life in the world or in a particular habitat or ecosystem
Autotroph (producer) An organism that obtains organic food molecules (ex: glucose) without eating; first trophic level in an ecosystem
Photosynthesis The process of using energy from sunlight to produce carbohydrates or food
Cellular respiration The process of breaking down organic molecules to produce ATP
Chemosynthesis The process of using energy derived from inorganic molecules to produce carbohydrates or food
Inorganic Not consisting of or deriving from living matter; ex: ammonia, hydrogen sulfide, methane
Heterotroph An organism that obtains organic food molecules (ex: glucose) by eating
Detritivore A consumer that derives its energy and nutrients from nonliving organic material such as corpses, fallen plant material, and the wastes of living organisms
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