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The reason we need to save or conserve an ecosystem is because they are all interdependent, if one ecosystem is thrown off balance it causes a domino affect down the food chain/web.e thus need to save the ecosystem that supports us inorder to save ourselves from the damage we did to the environment that gives us our food, clothing and shelter. As Walter Kelly said in the Comic Strip Pogo,  We have met the enemy and he is US ! . Source(s):
Objectives. 1  Understand that in order to survive, animals need air, water, food, and shelter, and plants need air, water, nutrients, and light. 2  Identify the ways in which an organism's habitat supports its basic needs. 3  Recognize that organisms cause changes to the environment in which they live.