Only water not present in oceans is available for living things to use.
Almost all of the water on earth is salt water in oceans.
Which of the following explains why water is a limited resource?
Water is present on Earth in a fixed amount that does not change.
Water is degrading slowly with time.
Only water not present in oceans is available for living things to use.
Once it ends up as groundwater, water is no longer available for living things to use.
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