challenge: What is the time span of the existence of the Gervillia genus in the fossil record?
  
  A. From the Jurassic period to the Cretaceous period
  B. From the Carboniferous period to the Eocene period
  C. From the Paleogene period to the Pleistocene epoch
  D. From the Triassic period to the Oligocene period
  Answer: 