Lake ecosystem and nutrient source

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Lake ecosystem and nutrient source http://shomusbiology.weebly.com/ Download the study materials here- http://shomusbiology.weebly.com/bio-m... Marine ecosystems are among the largest of Earth's aquatic ecosystems. They include oceans, salt marsh and intertidal ecology, estuaries and lagoons, mangroves and coral reefs, the deep sea and the sea floor. They can be contrasted with freshwater ecosystems, which have a lower salt content. Marine waters cover two-thirds of the surface of the Earth. Such places are considered ecosystems because the plant life supports the animal life and vice-versa. See food chains.