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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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Genes are the blueprint of our bodies, a blueprint that creates a variety of proteins essential to any organism's surviv..

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This tutorial looks at the relationship between organisms. It also explores how energy is passed on in the food chain 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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Plants are responsible for incredible feats of molecular transformation. Plant processes, such as photosynthesis, photop..

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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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