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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):
Protists are important to the earth's ecosystems because they were the first complex life on earth, provide as a food source to many living things, and help clean large bodies â¦ of water.6 people found this useful.or example: they provide foods, medicines and energy; they regulate nutrient recycling and waste; they lock up carbon; they maintain clean air and water, they supply crop pollination, seed dispersal, pest and disease control; they preserve genetic diversity and provide recreation for us all.