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Stems primarily provide plants structural support. This tutorial includes lectures on the external form of a woody twig ..

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The arthropods were assumed to be the first taxon of species to possess jointed limbs and exoskeleton, exhibit more adva..

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Human Biology – Food and Digestion

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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Seed Plants

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

Plant meristem
Plant Meristems and Growth

In plants, growth occurs in meristems, which are the site of repeated cell division of unspecialized cells. These cells ..

Community Patterns

Learn about community patterns and the ecological factors influencing these patterns. Revisit some of the ecosystems you..

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