57.Which of the following factors might affect Dr. Begall’s research result?(A) Rainfall.(B) Earthquakes.(C) Location.(D) Google Earth

59.Why couldn’t the researchers get the answer to their research questions?(A) Many cattle in their study were sitting on the ground.(B) The cattle constantly change directions to avoid wind chill.(C) There is magnetic difference between the two hemispheres.(D) They couldn’t tell a cow’s head from its tail in the satellite pictures.