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What is a mechanism by which organisms maintain homeostasis when the level of one substance influences the level of another substance or the activity of an organ.

Whiat is the best example of a story's historical content?

According to nature, how does emerson suggest man should go about building his own world? what will be the result of such building? evaluate his vision of the future from a biblical worldview (reference, especially, rom. 1: 18–32)