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It looks like they are helping, they are cleaning hem off maybe

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ANIYAH
Ecosystems can be changed by water and air pollution ,

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volcanoes  erupt and other storms can affect this

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When invasive species show up it can cause big changes to the food web.

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Two ways ecosystems can change are invasive species and over population

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An ecosystem can change by earthquakes and floods. Another way is storms , hurricanes . Another way is zebra mussels, and vol

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Haiden                       Ecosystems can change from natural disasters and living organisms.

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Haiden                       Ecosystems can change from natural disasters and living organisms.

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Tyler:The ecosystem can change by,Animal's being extincted from a food chain then it will kill other animals from the food chain because thats the predators food and if the predator dies then the predator of that predator will die too.

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Tyler:The ecosystem can change by,Animal's being extincted from a food chain then it will kill other animals from the food chain because thats the predators food and if the predator dies then the predator of that predator will die too.

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an ecosystems can change by. Polshin to the in virment and it can shang by  invasive species.

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Ecosystem change when a beaver build dams. Also when humans pollution  the air.
Zebra mussels are a problem they eat platen it destroying the food web

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a ecosystem can be changed by a species dying that helps keep the world heathy. It can also change by water pollution and air pollution  because it can kill some species and then others die because if some die the animals that eat it will die to because It wouldn't have some thing to eat so it would die.

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A beaver can build a dam and a flod could happen.Also a oak tree could die and then a new one would pop up but it wasent a oak tree it was a hilkory.

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Nathan Glisson
Ecosystems can be changed by beavers or human palushon also an invasive species like zebra musles can eat a lot of plancktin in the ocean and in the river and lake they are an invasive speais and they couse millions of dollars of damage in water pipes and more.

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An ecosystem can be changed by when people pollute .Or when people cut  down all the trees

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Ecosystem can change by, beavars cause when they build their dams  or it humans come in and cut all of the trees down the birds will no more have a place to put nets and also  if a animal dies. If a the cows population  grows there will be no more grass for the other animals.

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It can change by to many animals or polltoin in water are air and soil. It also can change by animals like zeba mussel eating planik that is eaten by fish.

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Ecosystems can change by mother nature like floods,tornadoes, and more.Ecosystems can change when an animal gets extinct, then other animals can't get their food then they die.One more thing humans can change an ecosystem and cause air pollution.

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An ecosystem can change if people  keep polluting, and the zebra mussels are harming the great lakes. Beavers harm the rivers by building dams because the dams can harm the other animals that live in the rivers.

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A Ecosystems can change by a invasive species or something dies and what that animal  eats population would get larger. Also trees can get cut down or over hunting, air pollution.

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The ecosystem changes when humans pollute. Also when mother nature makes thunder storms, earthquakes, and volcanic eruptions.

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An ecosystem can change by
tornado, hurricanes,and hail.And invasive species.