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unit 11

ecosystems/food chains

environment all the living and the nonliving things that surround and affect an organism
ecosystem a community of organisms and the environment in which they live
population a group of organisms of the same species in an ecosystem
community a group of organisms that live in the same area and interact with one another
biotic living
abiotic nonliving
habitat The place where an organism lives; its home
niche The role a plant or an animal plays in its habitat
narrow niche when an organisms has a very specific way of living and eats only specific things
broad niche when an organism can eat many different kinds of foods and can live in many different places
tropical most diverse climate zone
polar least diverse climate zone
limiting factors (4 things needed to survive) food, shelter, water, space
consumer organism that cannot make its own food
herbivore eats only producers
producer organism that can make its own food
carnivore eats only meat
omnivore eats both plants and animals
food chain transfer of energy from one organism to the next in ecological order
photosynthesis process in which plant and plantlike organisms make their own food
food web overlapping food chains
extinction plant or animal species that no longer exists
succession a gradual change of organisms in an ecosystem
decomposer organism that breaks down dead plants and animals
scavenger organism that eats dead plants and animals



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