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This tutorial recognizes the importance of food as a source of energy that will fuel many biological processes. A good d..

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Chemical composition of the body
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The body is comprised of different elements with hydrogen, oxygen, carbon, and nitrogen as the major four. This tutorial..

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Certain species are capable of expressing characteristics indicative of the state of the ecosystem they occupy. They are..

Physiological Homeostasis
Physiological Homeostasis

Homeostasis is essential to maintain conditions within the tolerable limits. Otherwise, the body will fail to function p..