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Chapter 20 and 21

community all the populations of different species living in the same area at the same time
population all the organisms of the same species that live in the same area at the same time
endangered species population that is at risk of extinction
extinct species population that has died out
threatened species population at risk but is not yet endangered
consumer organism that gets energy by eating other organisms
habitat place within an ecosystem where an organism lives
niche what a species does in its habitat to survive
predator organism that survives by hunting
producer organism that gets energy from making its own food
food chain model showing how energy flows in an ecosystem
food web model of energy transfer showing how the food chains a community are interconnected
abiotic factor nonliving thing in an ecosystem
biotic factor living thing in an ecosystem
ecosystem living and nonliving things in a given area
detrivores consumers that feed on dead organisms
decomposers recycle nutrients back to the soil through the ecosystem and carbon dioxide that enters the atmosphere
carnivores eat other animals (consumers)
herbivores feed only on plants (producers)
omnivores feed on producers and consumers
autotrophs organisms capable of making their own food (plant and bacteria)
heterotrophs rely on autotrophs (producers) and consumers for food
invasive species species that causes trouble or threatens the biodiversity of an ecosystem



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