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i knew the answer the atmosphere sorta runs interference for us,the point was to see if it made you wonder why earth was all by itself and why the so-called evolution only happened to a single planet.
Because of all the planets we have observed, ours is the only one with conditions that would allow evolution to occur.
and the reason for that is?
why isn't the earth full of craters like all the other planets and moons?
Thickness of the atmosphere. The planets you see "full of craters" don't get "shooting stars" .... all of their debris hits the surface. Most of what enters our atmosphere burns up before it hits.