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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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This tutorial elaborates on how the nervous system works, particularly at the tissue level of the brain. There are three..

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The blood sugar level is regulated by two hormones. The mechanism behind this type of negative feedback control is descr..

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Running Water Freshwater Communities

This tutorial introduces flowing water communities, which bring new and dithering factors into the equation for possible..

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Neurons generate electric signals that they pass along to the other neurons or target tissues. In this tutorial, you wil..

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