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Darwin's Finches are an example of natural selection in action. They are an excellent example of the way species' gene p..

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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 water cycle (also referred to as the hydrological cycle) is a system of continuous transfer of water from the air, s..

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This tutorial elaborates on the effect of light on plant growth. It describes how different plants require different amo..

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