Maya: Dr. Thompson, a behavioral scientist, has convincingly shown that his model of squirrel behavior leads to consistently accurate predictions about how squirrels will navigate through a complex obstacle course. Based on this evidence, Dr. Thompson has asserted that his model is undeniably correct. Liam: Then Dr. Thompson is not a responsible scientist; his evidence does not definitively prove that his model is correct. Responsible scientists always acknowledge the possibility that new findings could demonstrate that their models are incorrect. Liam bases his conclusion about Dr. Thompson on which one of the following?