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This tutorial looks at sex determination via the sex chromosomes, X and Y. Read it to get more info on X and Y chromosom..

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Illusions are the perceptions and sensory data obtained from situations in which human error prevents us from seeing the..

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Different pregnancy and birth control and contraception strategies are described. Read this tutorial to learn each of th..

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The cell is defined as the fundamental, functional unit of life. Some organisms are comprised of only one cell whereas o..

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

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Ecological Research: Measuring & Analysis

This lesson is about the methods used for ecological research, such as quadrat and transect sampling, canopy fogging, an..