[Campbell Biology P.587] According to the 'INTERPRET THE DATA' section, if a horizontal bar ... | Practice Question

According to the 'INTERPRET THE DATA' section, if a horizontal bar on the graph measures 2.0 cm, what is the estimated persistence time of that species?

  • A: 7.2 million years
  • B: 4.0 million years
  • C: 25 million years
  • D: 7.0 million years

Explanation

The text states the conversion factor is 3.6 my/cm 25 my / 7.0 cm = 3.6 my/cm . Therefore, a 2.0 cm bar represents 2.0 cm 3.6 my/cm = 7.2 million years.