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How do aquatic animals breathe under water?

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They are filled with blood vessels and when a fish breaths by taking water in through their mouths, the dissolved oxygen moves into the bloodstream when the water is forced out through the gills. Not all aquatic animals breath through gills however, some like dolphins, are mammals and have lungs. read more

Aquatic plants are able to absorb the carbon dioxide (CO2) they need to make food directly from the water around them through their leaves, just as land plants obtain carbon dioxide from the air. The water provides the nutrients necessary for an aquatic plant to"breathe" underwater. read more

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