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The circulatory system is key to the transport of vital biomolecules and nutrients throughout the body. Learn about the ..

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Hormones are produced in the endocrine glands of animals. The pituitary gland and hypothalamus are the most impor..

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This tutorial noted some of the physical and chemical factors that provide the framework of a running water community in..

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Plants are characterized by having alternation of generations in their life cycles. This tutorial is a review of plant m..

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Freshwater Lentic Communities & Animals

This tutorial looks at some of the communities in freshwater lentic habitats. For instance, symbiosis occurs in a commun..

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Freshwater Communities & Plankton

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