kennethprince kennethprince

11-05-2015
Social Studies

Answered

explain how changes in an ecosystem can sometimes be helpful and sometimes harmful

Answer :

Аноним Аноним

12-05-2015

I will explain in an example a good change would be A group of kids planting trees this could make a food source for plant eating animals and it also would create more oxygen

A harmful one would be cutting down trees to make a new mall, This is the exact opposite of the one above, less food for plant or leave eating animals and less oxeygen

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