Plants and animals require large amounts of water in order to survive. Although vast numbers of plants and animals have lived throughout time, the amount of water in our environment has remained relatively constant. Which of the following statements explains why this occurs?
Water continually flows from the center of Earth.
Vast quantities of water are created by lightning in clouds.
Organisms return water to the environment after they use it.
Organisms combine hydrogen and oxygen to make their own water.
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