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the variety of life in the world or in a particular habitat or ecosystem.

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there are many threats to the earth's biodiversity.

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a unit of heredity which is transferred from a parent to offspring and is held to determine some characteristic of the offspring.

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She inherited a good set of genes from her parents.

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an organism that helps define an entire ecosystem.

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Some rodents are considered keystone species and ecosystem engineers in their respective habitats.

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tourism directed toward exotic, often threatened, natural environments, intended to support conservation efforts and observe wildlife.

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Now it is coming out with ecotourism programs to attract tourists

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a species of animal or plant that is seriously at risk of extinction.

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The men are accused of breaking state laws that protect endangered species

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any species which is likely to become an endangered species within the foreseeable future throughout all or a significant portion of its range

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We who live in the national park are a threatened species.

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 organisms that have been introduced into an area outside their normal distribution

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Exotic species growing in the reserve were not included in the census as they were rare and frequently cut down by the game guards.

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o take and use someone or something that belongs to someone or something else, especially in a secret, dishonest, or unfair way

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he was caught poaching pheasants

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the number or quantity of people or things that can be conveyed or held by a vehicle or container.

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The car's carrying capacity is just 360 pounds

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the role an organism plays in a community

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A species' niche describes how it fits within its environment.

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Prices are lower when there is competition among the stores

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relationship between the two living species in which one organism is benefitted at the expense of the other.

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oon after, he was charged with parasitism and sentenced to public works building an industrial plant.

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the act of an animal killing and eating other animals

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the doctrine that mutual dependence is necessary to social well-being.

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Labour grew out of popular movements of mutualism and self-help.

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an association between two organisms in which one benefits and the other derives neither benefit nor harm.

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This long-established commensalism indicates that these microbes are an integral part of the eukaryotic host

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interaction between two different organisms living in close physical association, typically to the advantage of both.

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The bird lives in symbiosis with the hippopotamus.

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he study of statistics such as births, deaths, income, or the incidence of disease, which illustrate the changing structure of human populations.

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The increase in the number of young people leaving to work in the cities has had a dramatic impact on the demography of the towns.

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he proportionate numbers of people in different age categories in a given population for a defined time

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Age structure revealed that most of the sample is immature and aged 0+ (86.7 %).

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initially divided into two teams (“tribes”) 

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Above all Susie is a great survivor, with a bright, indomitable spirit. He was the sole survivor from that winning side.

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the state or condition of being a survivor; survival.

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I was involved in planning the memorial from the beginning, partly because of my survivorship.

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The total fertility rate is the number of births a woman would have if she followed the average patterns of births in her country during her lifetime. 

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he country's birth rate fell to a record low last year.

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movement of a group of people or animals from one place to another.

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There was a mass migration of poverty-stricken farmers into the cities.