why do the living things exist only on the earth
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All living things on earth have adapted to our atmosphere, which means all living things need our mix of atmospheric gases. Life elsewhere would be specifically adapted to their own conditions. Water is a really important ingredient to sustain the kind of life we know on Earth.
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Earth is the only inner planet in our solar system that has liquid water on its surface. Seventy percent of the surface is covered by oceans where photosynthesis takes place. This makes the ocean the principal life habitat on Eart
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