Just as animals on land evolved lungs to remove and collect oxygen from the air to breathe so many aquatic animals developed gills to remove and collect dissolved oxygen from water but there are a number of water-dependent animals such as Wales often and alligators that also breathe oxygen from air so and Aquatic environment provides Additional services - security and food.
Without liquid water it is generally believed that life would not be possible for daily or weekly water is recommended for the vast majority of creatures the longest-lived life form without water and a tardigrade which can survive at to 120 years but must still have water to maintain life beyond this point.
tardigrade
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