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Certain species are capable of expressing characteristics indicative of the state of the ecosystem they occupy. They are..

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The hominid family diversified from the apes around 6 to 8 million years ago. Since then, the evolutionary path has prov..

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Birth Control and Contraception

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

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ATP is the energy source that is typically used by an organism in its daily activities. The name is based on its structu..

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Ferns and their relatives are vascular plants, meaning they have xylem and phloem tissues. Because of the presence of va..

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