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A ecosystem can change when a beaver builds it's dam because it can flood the land. Another things that changes ecosystems
is air population and smog can cause some people to die air population because its produces chemicals in the air can cause things to die. Clear cutting can be bad because when they cut down trees that's bad because we need trees to stay alive and you can be destroying animals homes cutting down trees because some animals live in trees.

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Air polutin and smog can cause people with asthma can die of air polutin and many companys products make chemicals and those chemicals can cause many fish such as trout,bass,catfish,and more to die and maybe go extinct and its all because of us and that's not all we are using are fossil fuels to fast and we are loosing them faster when we have oil spills and that also kill the animals living there.Also if we plant the same crop in the same place forever it will suck all of the nurients and then no crops can be planted there and guess what we hurting are selves by using to many fossil fuels and many places have turned from beutiful clouds and full of wildlife to black smog and no site of a living thing.

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One way is if you feed the fish  something bad it would kill the fish and the big fish would die and the little fish would over populate and the alga would be gone If a storm comes it could kill the deer that means the wolfs or coyotes would die and the grass would be so tall. If a mouse dies the snakes would die and the berries would all over the place all that could happen.

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One way that an ecosystem can change in a bad way is when a big truck has all that smoke coming out and it's polluting the air. Another way that it could change badly is when a beaver will build a dam and if it gets to high it stops all the water coming through. And one more reason is if someone cut down a bunch of trees and never grows more trees and the trees and plants give living things oxygen. There are also these things called Zebra Mussels and they eat all these little plankton and that gives no food to the fish and they get stuck on your boat and then you move to another lake and they spread there. There is also a thing called kudzu that grows over your car and trees and it spreads a lot and very fast. Storms can also cause major damage because a hurricane will take down the trees and so will tornadoes and lighting could burn the trees and some animals lose there homes and there population keeps getting less and less and floods cause distruction and will over flow where fish are and there population will grow

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a way that a ecosystem can change in a bad way is like the zebra mussels. For example a way that the ecosystem could change in a bad way  is pretend they add a new plant called zerk and they put that plant in to be a good thing cause there seaweed was dying out and that put zerk in after maybe a few days a bunch of Zerk would be crouding the ocean floors that would be bad.Another way an ecosystem could change is if an animal goes extinct and there is no more of the animal after that its prey would overpopulate which would result in them eating to much of there prey cause the to many of them. A way that it could change In a good way would be an example like let say theres a flower lets just call it rose pretend that someone put a rose in this world to help kill something that wasn't meant to be let in our world or ecosystem and it turns out the rose doesn't kill but it is a pretty flower that helps with a sickness.They are many other ways like pollution,storms, and oil. Oil could change a lot cause once it is released it is hard to get it all back where it came from it could harm the plants that would kill one animal and then another then before you know it they would all be dead.  Another example when we drive cars we are polluting the air cause cars contain gasoline and other chemicals and gasses. It is also bad if you pollute water cause it hurts the fish and there home/water turns green or black which is VERY harmful.It is very hard to replace something or try to get back an oil or gas or something bad like that.

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Three ways an ecosystem can change.Are by natural disasters, like flooding and storms.Beavers also cause damage to the ecosystem by building their dams.Or by introducing a new species(zebra mussels)that hurt the ecosystems.

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One way an ecosystem can change is when you cut down trees you are the making the animals that live in the tree fall out or die. A second way the ecosystem can change is when volcanoes erupt the lave can flow down and burn all the trees and animals that lived there. The third way an environment  can change is  when the zebra mussels get into lakes and ponds because of people that leave water in their boat and when they go fishing again zebra mussels get into the lake.

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one way is that  beavers can build dams  by making them out of trees stones, and mud. That cause us not to breath and cause floods to sink cities. And the other thing is that it could kill the habit of many. Animals like fish ,bears , and the wolf

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ecosystem's can change by humans or animals like a beaver it make's a dam and the effect of this is that birds lose homes and also fish down stream die beacuse of lose of water to make it even worse if the little fish don't eat enough algie they die and all of the other fish die fish them and that is the first way of how an ecyostem's can change but the second way is with humans is that we have factories and we have smog and air pollution and gross water like in brazil we have factories that make smog and air pouliton and with all of that it goes into the atmospyher and it make's green house gases and it comes in piles and piles and blocks the sun the sun from the atmospyhere and it gets stuck in the clouds and then when it rains it comes down and then make's water that is poulited and then that fish die and then big fish die

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It would be bad if you cut down all the trees in one area it is also called clear cutting  and there is also air pollution is where fartorys made stuff and smoke came from the pipes. Bevers also bulding dams can be bad some times because the fish below it would not get clean water and it would be good for the fish at the top because they get deeper water  and clean water

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 Briceson hensley If all the trees in one erary get cut down then some animals are loosing their homes and their invirment so they have to leave and try to find some where else to try and adapt to.

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 Briceson hensley If all the trees in one erary get cut down then some animals are loosing their homes and their invirment so they have to leave and try to find some where else to try and adapt to.

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When beavers cut down trees it gives us less oxygen. When the beavers make their dams it stops the water from flowing. When they stop the water from flowing the fish at the bottom will die because of lack of water. When the water stops flowing the water might flood and the trees start to get to much water and the trees will die. One other way that the ecosystem might change can be air ploution because if we drive cars to much the gas sort of evirates and comes out of the

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Dillon                                                                                                                                                        An ecosystem can change by an oil spill or a tiny beaver  can make a big change building its dam or poultion,litter,smog an example if the pouliton can kill the animals and people or a wildfire can  burn peoples houses or animals home.

# data[].attributes.subject
Dillon                                                                                                                                                        An ecosystem can change by an oil spill or a tiny beaver  can make a big change building its dam or poultion,litter,smog an example if the pouliton can kill the animals and people or a wildfire can  burn peoples houses or animals home.

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One way an ecosystem can change is cutting down trees if to many trees get cut down then the animals inside the trees die. Another way an ecosystem can change is air pollution, if there is a factory near by then the air changes and the animal can die. The last reason is over and under populating.

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One way a ecosystem changes is because litter because litter can kill lots of  living things. This one you may not think about but birds can change the ecosystem because they search for things to build there nest and so if people litter and the bird tries to use the litter to make a nest it could harm the bird. A another way is that when we hunt if we cause a animal that eats insects to go extinct and  then the insect population might over populate and if the insects eat plants Since there are more of them they are going to eat up all of the plants and plants make oxgen for humans. So, if all plants are gone we could die! Also natural diasters can really change the ecosystem. Plus, beavers make dams and the dams stop the water and the fish below the dam will die because there are know more water. And if the fish population goes extinct then bears might become extinct or endangered. Plus Kudzu will grow on everything and will cover it all up in a short amount of time. Since kudzu spreads it could cover up birds nest. Also the smoke from factores can polute the air and make it bad for birds.

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One way is if a volcano erupes it could be big and caues many problemes .  One bad thing is many things die but that gives nutreons back to the ground or animals lose their homes.  The weird thing is after years and years plants come back to the ecosestem.  Maybe animals will come and make a new ecosestem .  Car polution is an other thing it

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An ecosystem can change if an animal becomes extinct. A beaver can over populate fish in one area because of its dam and eventually they will all die from lack of food when they ate it all. They also cut down the trees to make the dam, so whatever is living in the tree just lost their home and we lost a little more of our oxygen. Lets say us humans hunt all of the bears and they become extinct. What ever the bear eats would over populate because they do not get hunted down. Then if they over populate there would be no more food for them to eat because they ate it all, so they would die as well and so on. But you can also say it in a different way, if all the bears were hunted whatever ate the bear would have no food and die out. Whatever got hunted by the animal that eats the bear would over populate and whatever it eats would die out witch would cause the over population to stop and become extinct. If something new is introduced to an area it can cause problems like the Kudzu did. When the Kudzu was introduced it caused problems like growing over cars, mountains, trees, and houses. If it grows over mountains and trees they would die and less oxygen. There is an insect that eats the Kudzu but w can't really introduce it because it might eat other plants we need so we are stuck with them. So thank you for you're time and hopefully you have a new respect for the way we live.

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An ecosystem changes from these three things pollution, litter, and smog. One example is air pollution it can kill all the animals in an ecosystem. And litter can kill animals like a bear finds something and eats it than that bear dies and then there is one less bear than there wont be any bears.

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One  example water pollution will kill fish. Another example is  when people burn things in factories it puts air pollution in the air. Also beavers they build dams and clog up the water flow then the fish that passed the dam that the beaver has made would die because there is no water flow coming threw for them to survive on. Another way an ecosystem can change is by people bringing in bactiria, fungi, and plants from there boats that they have used in other lakes and rivers without wiping it down or spraying it down with water.. Another way is when people cut down a lot of trees down in one area (clear cutting). Another way a ecosystem can change is by a oil spill in the lake or ocean. Another reason is when people drive up in the moutains with their window down and throw litter out the bears or fishes habitat is ruined.