While hiking in the forest, paul came upon a bear hunting along the river. paul knows the best thing to do is to remain quiet and back away very slowly, but his body is suddenly primed to run away at full speed. the system is activated when paul first encounters the bear?

Dr. arenas is a scientist who has been trying to determine if increasing pressure will increase the sound that occurs when two chemicals explode. it measures the volume of the sound that occurs at the minimum pressure at which the explosion will occur. it then increases the pressure and measures the volume of the explosions that occur. what kind of investigation is the scientist conducting?