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==Explanation==
 
==Explanation==
Analogies to explain the passage of billions of years are often used in popular science explanations, to help compress these huge spans of time into something the human mind can comprehend; the football field analogy is one such analogy. {{w|History of Earth|The Earth is approximately 4.54 billion years old}}; if you were to present a timeline of Earth as long as a football field (100 yards or 91 meters), then each inch of that length would comprise more than 1.26 million years of Earth's history and each millimeter nearly 50,000 years.
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Analogies to explain the passage of billions of years are often used in popular science explanations, to help compress these huge spans of time into something the human mind can comprehend; the football field analogy is one such analogy. {{w|History of Earth|The Earth is approximately 4.54 billion years old}}; if you were to present a timeline of Earth as long as a football field (100 yards), then each inch of that length would comprise more than 1.26 million years of Earth's history.
  
 
* Complex life refers to the various animal species which arose in the {{w|Cambrian explosion}} 541 million years ago; the length of time that complex life has existed would translate to 11.9 yards on the football field.
 
* Complex life refers to the various animal species which arose in the {{w|Cambrian explosion}} 541 million years ago; the length of time that complex life has existed would translate to 11.9 yards on the football field.

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