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All the organisms depend on each other. for example, take sparrow campaign in china. it killed lakhs of sparrows. this effected their crops and production. they had to use excess amount of chemicals causing great famine in china. so we can say that all organisms depend upon each other.
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Organism depend on each other for their food chain  . For  Mouse eat grass . then mouse is eaten by  snake  and snake is eaten by hawks 

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