Science 8-9

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17 Terms

1
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mutualism

two organisms benefit

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commensalism

one organism benefits, other is not harmed

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parasitism

one organism benefits, other is harmed

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competition

two species fighting for the same resources

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predatory

one organism kills another

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population

same species all living in the same area

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demography

statistical study of populations

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population density

the amount of one species living in a specific area

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dispersion

the spacing of organisms in a population relative to another population in that same area

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three types of dispersion

clumped, uniform, random

11
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three ways to count a population’s size

direct, sample size, mark and capture

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clumped

all in one area

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uniform

spaced out orderly

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random

no pattern or sense

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direct

counting the people in the room

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sample size

taking a few people and estimating how many

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mark and capture

giving a bird a tag