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Animals living in aquatic habitats have diversified and evolved through time. They eventually occupy ecological niches a..

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Multicellular organisms evolved. The first ones were likely in the form of sponges. Multicellularity led to the evolutio..

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A balanced diet is essential to a healthy organism. Insufficiency or too much of a particular element or compound, such ..

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Pollution in Freshwater Ecosystems

There are many environmental factors that arise due to the usage of water in one way or another and for every action tha..

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Running Water Freshwater Community Factors

This tutorial noted some of the physical and chemical factors that provide the framework of a running water community in..

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Primitive Animals

Life, as we know it today, is presumed to have started in the sea and many of them were likely eukaryotic animal-like or..