This page contains polls dedicated to When did life first appear?.
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The first signs of life are thought to have appeared about 3,000 million years ago. Some rocks from this time contain substances that are characteristic of life, although fossils appear from much later.

Scientists believe that primitive life forms altered the original poisonous composition of the atmosphere, eventually releasing the oxygen that we need to survive. The seas were probably once filled with a mixture of chemicals from which life may have developed.

It is more likely, however read more...

Tags: life, bacteria, science

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