Evidence Points to the Formation of Earth 4

Short Answer

Evidence points to the formation of Earth 4.6 billion years ago and the first signs of life arising on Earth 4.0 billion years ago.That means that there was a 600-million-year period during which certain conditions could have developed to the point that life could arise.A limitation of simulation experiments, such as those conducted by Miller and Urey, is that they cannot simulate the extremely long time period during which Earth existed in a _______ state.