Read the excerpt from "Bone Detective," by Lorraine Jean Hopping. Diane picked up one of the skull casts in her lab and held it up to her visitors to see. She pointed out two rounded gaps in the teeth on either side of the jaw.

"This guy smoked a pipe,” she explained. "He started on one side and then, when the pipe ground down the teeth, he had to switch to the other.”

Which statement best describes Hopping’s viewpoint and purpose in this excerpt