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Oxygen and energy
Trees, because they give off oxygen. Every organism (living thing) needs oxygen to breathe obviously.
Earth gets every thing it needs to support life from the sun.
the top soil of earth can support life
Earth
So far, earth is the only planet known to support life, but many scientists thing that life probably exists on other planets.
Destroying the ozone allows UV. These affect life on earth.
Only Earth.
Earth
Earth
earth
The biosphere is where all ecosystems exist.The amazing thing is that scientists have found life even in sulfur pools and in the deepest oceans, in deserts etc.