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The human body is capable of regulating growth and energy balance through various feedback mechanisms. Get to know the e..

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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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Planktons are microscopic organisms that live suspended in aquatic habitats. There are two groups: the phytoplanktons an..

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Chemical Composition of the Body

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

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The sea was teeming with life. Eventually, through reproduction and continued variation, fish came about. There are over..

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Seed plants are vascular plants. They differ from the other vascular plants in producing seeds that germinate into a new..