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WebThe earliest evidence of life on Earth comes from fossils discovered in Western Australia that date back to about 3.5 3.5 billion years ago. These fossils are of structures known as … WebApr 27, 2024 · Approximately 4.5 billion years ago, scientists believe that Earth collided with a planet the size of Mars. The energy from this catastrophic collision blew Earth’s … WebEarth's early atmosphere was a good environment for complex organic molecules to exist, even before life evolved. We know from the Miller-Urey experiment that organic molecules can form in ... ferdinand and isabella definition