Summary
The water helped the first tiny living things start to grow.
Because of water, Earth became able to support many kinds of life.
Key Points
3 points1
Water covered most of the planet three billion years ago.
2
The first tiny living things, called organisms, lived in the water.
3
Water's role helped Earth develop many different life forms.
New Words to Learn
4 wordsorganisms
very small living things such as tiny plants or animals
evolution
the slow change of living things over many, many years
billion
a huge number equal to one thousand million
planet
the big round world we live on
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