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Last but not least, we've got aquatic ecosystems, which, depending on their salinity, can be located in freshwater or saltwater environments.

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Marine ecosystems are the ones with really high salinity. Their water is in constant movements due to the waves and currents there.

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We've got three types. Sandy beaches, which are the ones affected by tides and waves, and home for seagulls, for example.

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Number two, rocky shores, which are the ones with shallow areas with sunlight.

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And last, the open sea, which are the ones in deep sea far from the coast, where sunlight reaches depths of 100 meters.

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Then we've got freshwater ecosystems, which are the ones with really low salinity.

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Their water may or may not be in constant movement, and there are also two types.

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First ones are rivers, which have cold water that is always moving really fast,

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and second ones are lagoons, which are the ones where water barely moves,

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and vegetation provides shelter for all the animals there.