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Ecosystems

natural selection, food webs

TermDefinition
natural selection The process where organisms that are best suited to their environment survive and pass on their traits to following generations
artificial selection (selective breeding) Breeding plants and animals for specific traits; humans decide which characteristics and behavior are desirable and choose organisms to breed together to get those things
evolution the process of a species changing, usually over a very long period of time
energy the ability to cause change
producer an organism that uses an outside energy source, like the Sun, and produces its own food, ex: plants
photosynthesis plants take energy from the Sun, water, and carbon dioxide and perform a chemical reaction to produce glucose (sugar) and give off oxygen
consumer an organism that cannot make its own food and gets energy by eating other organisms
herbivore an organism that eats plants
omnivore an organism that eats plants and animals
carnivore an organism that eats animals
detritivore an organism that eats the remnants of other organisms
food chain a model that shows how energy flows in an ecosystem by feeding relationships
food web a model that shows energy flow in an ecosystem through interconnected food chains
 



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