If the history of the earth is condensed into an hour, by the end of the last 15 minutes, the life square powder ink appears. With 6 minutes left, the animals began to flash on the land, and when the 58th minute comes, everything is set. What does this passage mean? ['Earth has a long history.', 'Earth has a long history.', "Earth's life appeared quite late.", "Earth's history is as short as an hour."]