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specification is a process of evolution. 

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can differentiate in neutral environment, but reversible in new environment Determination: irreversible even in new environment

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different animals have different genes in different gene pools 

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The stock of different genes in an interbreeding population.

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the polar bear has thick white fur as an adaptation

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traits an animal has to increase survival

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Natural selection is a key mechanism of evolution, which is the change in the heritable traits characteristic of a population over generations

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natural selection is a key of evolution in every animal life cycle

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A large naturally occurring community of flora and fauna occupying a major habitat

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There are two types of succession primary and secondary 

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Process in which the mix of species in an area changes over time

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An invasive animal can be very dangerous and difficult to deal with 

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A species that is over populated to the point where it hurts other populations of animals

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Pollution is a huge problem in our world today 

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The process of continuous dumping of trash in a uncontrolled manner

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The fish in the oceans are being over exploited 

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The over use or hunt of something

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 Habitat destruction can be caused by human activities like farming, mining, drilling, and urbanization

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Habitat destruction is the elimination, alteration, or damage of natural habitat that makes it unable to support the species that live there

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Endangered species are facing a very high risk of extinction in the wild

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Endangered species meaning is a type of organism that is at risk of extinctio

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Without its keystone species, the ecosystem would be dramatically different or cease to exist

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A keystone species is a species that has a large effect on its environment and biodiversity relative to its abundance

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The effect of carrying capacity on population dynamics is modelled with a logistic function.

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Carrying capacity is the maximum number of organisms (such as deer) or things (such as persons) that an area, environment, or receptacle can support without undergoing deterioration or affecting the ability to regenerate the necessities that populations need to survive

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The interactions between one animals and the next

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With so many cupcakes stores open, it is hard to find a competitive niche in that market.

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 the natural environment of a living organism

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Habitat is a noun that means the residence where an animal or plant normally abides

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different Geno types Casuse genetic drift 

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variation in the relative frequency of different genotypes in a small population, owing to the chance disappearance of particular genes as individuals die or do not reproduce.

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An ecosystem (or ecological system) consists of all the organisms and the physical environment with which they interact.

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The marine ecosystem is made up of all living organisms in saltwater bodies

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 She believed that the greatest goal in life was to serve the community

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all the various living things that live in a particular area.

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The population of China is over one billion people.

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the number of living beings in one area of any particular group or faction.

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