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involves:
1. catching the organisms, making them and then releasing them
2. returning at a later time and catch the same species again
3. count how many of the newly captured organisms have already been marked
4. use a mathematical fomula to estimate the total population

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involves counting the number of organisms in a small area and then multiplying to find the the amount for a larger area

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involves observing signs of an organism rather than the organism itself

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involves counting all of the population's members

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the largest population that an area can support

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an environmental factor that causes a population to decrease

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the number of individuals in a specific area

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to leave a population

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moving into a population

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the number of deaths in a population in a certain amount of time

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the number of births in a population in a certain amount of time

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an approximation of a number based on reasonable assumptions

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the six ecological levels of organization (in order)

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the six ecological levels of organization (in order)

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1. individual organism
2. populations
3. community
4. ecosystems
5. biome
6. biosphere

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the study of how living things interact with each other and with their environment

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the community of organisms that live in a particular area, along with their non-living surroundings

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all the different populations that live together in an area

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all the members of a species in a particular area

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a group of organisms that are physically similar and can mate, reproduce, and have babies that can also mate and reproduce, and so on

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the non-living parts of a habitat

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the living parts of a habitat

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an environment that provides the things the organisms in it need to live, grow, and reproduce

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a living thing

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- all the regions of the surface, atmosphere, and hydrosphere of the Earth occupied by living organisms

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- all of the ecosystems on Earth with similar temperatures precipitation, and organisms

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- a community of organisms that live in a particular area, along with non-living surroundings

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- all the different populations that live together in one area
- they must live close enough together to interact

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- all the members of one species in a particular area
- species: a group of organisms that are physically similar and can mate with each other and produce offspring that can also mate and reproduce

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- a single living thing