EQ1: A system is a self sustaining environment with habitants that has inter-relationships with others that is able to sustain in a normal circumstance which does not require external help from other organisms that do not naturally belong to that environment.
EQ2: Humans are dependent on the environment for food and resources. This is because humans cannot produce food on their own. The environment depends on human for the removals of parasitic animals. This allows the environment to grow better.
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