• Fossils are the preserved remains or traces of organisms that lived in the past.
  • Fossils can be dated in two different ways: relative dating and absolute dating.
  • The fossil record is the record of life that unfolded over four billion years and pieced back together through the analysis of fossils.
  • A molecular clock uses DNA sequences (or the proteins they encode) to estimate relatedness among species.
  • The geologic time scale divides Earth’s history into divisions based on major divisions (such as eons, eras, and periods)
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