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The human respiratory system is an efficient system of inspiring and expiring respiratory gases. This tutorial provides ..

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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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Plants produce hormones to regulate their growth. Auxins, for instance, influence plant growth. Know the role of auxin i..

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This tutorial deals with the abiotic factors of the freshwater environment that determine what sort of life would be sui..

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Biological Cell Defense

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