The earth, when life originally came into being, was not a wonderful environment - exactly the right temperature, etc. for life.
Primitive lifeforms over many millions of years terraformed the environment of the planet into something much more comfortable.
Kinda-like breaking in a pair of plastic shoes.
:P
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"I do not agree that the dog in a manger has the final right to the manger even though he may have lain there for a very long time. I do not admit that right. I do not admit for instance, that a great wrong has been done to the Red Indians of America or the black people of Australia. I do not admit that a wrong has been done to these people by the fact that a stronger race, a higher-grade race, a more worldly wise race to put it that way, has come in and taken their place." - Winston Churchill, 1937 --{ORLY?}--
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