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45 The organisms on the left side of the tree are more closely related to each other than to those on the right side of the tree. Which of the following statements best describes the relationships among these organisms?

  • A) The organisms on the left share a more recent common ancestor with each other than with those on the right.
  • B) The organisms on the right share a more recent common ancestor with each other than with those on the left.
  • C) The organisms on the left are more similar to the organisms on the right due to convergent evolution.
  • D) The organisms on the left have a greater genetic diversity than those on the right.
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50 The divergence between the two populations of Rhagoletis must have occurred very rapidly because

  • A) The apple tree was imported into North America with European settlement approximately 200 years ago
  • B) Flies were imported into North America with European settlement approximately 200 years ago
  • C) Long-distance rail transport of fruit increased only after the American Civil War (1861 -1865)
  • D) Heavy use of gunpowder during the American Civil War (1861 -1865) led to increased mutation rates in many natural populations of plants and animals
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