the regions of the surface and atmosphere of the Earth (or other planet) where living organisms exist
a group of organisms of the same species populating a given area
(biology) taxonomic group whose members can interbreed
(ecology) a group of interdependent organisms inhabiting the same region and interacting with each other
the branch of biology concerned with the relations between organisms and their environment
a system formed by the interaction of a community of organisms with their physical environment
group of ecosystems that have the same climate and dominant communities
biological influence on organisms within an ecosystem
physical, or nonliving, factor that shapes an ecosystem
plant capable of synthesizing its own food from simple organic substances
Organisms that produce energy available for other organisms to eat
synthesis of compounds with the aid of radiant energy (especially in plants)
synthesis of carbohydrate from carbon dioxide and water
an organism that depends on complex organic substances for nutrition
any animal that feeds on refuse and other decaying organic matter
a person who eats all kinds of foods
organisms that break down wastes and dead organisms and return raw materials to the environment
organism that feeds on plant and animal remains and other dead matter
(ecology) a community of organisms where each member is eaten in turn by another member
small photosynthetic organisms found near the surface of the ocean
(ecology) a community of organisms where there are several interrelated food chains
animal constituent of plankton
each step in a food chain or food web
diagram that shows the relative amounts of energy or matter within each trophic level in a food chain or food web
the total mass of living matter in a given unit area
process in which elements, chemical compounds, and other forms of matter are passed from one organism to another and from one part of the biosphere to another
any substance that can be metabolized by an organism to give energy and build tissue
process in which bacteria convert nitrogen gas into nitrogen compounds plants can use to make proteins
conversion of nitrates into nitrogen gas
single nutrient that either is scarce or cycles very slowly, limiting the growth of organisms in an ecosystem
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