<P> An aquatic animal is an animal, either vertebrate or invertebrate, which lives in the water for most or all of its lifetime . Many insects such as mosquitoes, mayflies, dragonflies and caddisflies have aquatic larvae, with winged adults . Aquatic animals may breathe air or extract oxygen that dissolved in water through specialised organs called gills, or directly through the skin . Natural environments and the animals that live in them can be categorized as aquatic (water) or terrestrial (land). </P> <P> The term aquatic can be applied to animals that live in either fresh water (fresh water animals) or salt water (marine animals). However, the adjective marine is most commonly used for animals that live in saltwater, i.e. in oceans, seas, etc . </P>

Where do animals and plants get the oxygen from in the aquatic environment
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