The graph below depicts the rise in resistance to warfarin in a rat population. Notice that after reaching a peak of 100% resistance, resistance in the population declined. Please provide a plausible evolutionary explanation for this. 
Definitions:
Cranial Cavity
The space within the skull that houses the brain, lined by the meninges and protective in function.
Thigh
The area of the human leg between the hip and the knee.
Knee
A complex hinge joint that connects the thigh bone (femur) to the shin bone (tibia), allowing for flexion, extension, and limited rotation of the leg.
Serous Membrane
A thin, double-layered membrane that covers internal organs and body cavities, producing a lubricating serous fluid to reduce friction.
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