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Definitions

flash cards

AB
environmental sciencethe study of how humans interact with the environment.
environmenteverything that surrounds us.
natural resourceany natural substance that living things use.
nonrenewable resourcesources that cannot be replaced.
renewable resourceresources that are continually being replaced, even as they are being used.
biospherethe thin layer of life around the earth.
developed countrieshighly industrialized countries, whose citizens have high average incomes.
population crisisthe number of people growing too quickly for the earth to support.
consumption crisispeople using up, wasting, or polluting natural resources faster than they can be renewed, replaced, or cleaned up.
ecologythe study of how living things are related to each other-how they interact and depend on each other.
ecosystemall the different organisms living in a certain area, along with their physical environment.
biotic factorsthe living parts of an ecosystem-animals, plants, and microorganisms.
abiotic factorsnonliving parts of the ecosystem.
organismone individual living thing.
speciesa group of organisms that are able to reproduce together and that share common genes and therefore resemble eachother.
communitya group of interacting populations of different species.
predationone organism kills and eats another organism.
competitiona relationship between species in which they attempt to use the same limited resources.
paratismorganisms that live in or on another organism and feed on it without immediately killing it.
mutualisma cooperative partnership between two species.
commensalisma relationship in which one species benefits and the other is neither harmed nor helped.
food chaina sequence in which energy is transferred from one organism to the next as each organism eats another.
trophic leveleach step in the transfer of energy through an ecosystem.
water cyclewhen water moves between the atmosphere and the earth.
successiona regular pattern of changes over time in the types of species in a community.


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