The figure below shows what happens in insect populations when crops are sprayed with insecticides.This is an example of ______. 
Definitions:
Valid
Legally or logically sound; having legitimacy or credibility, typically applied to arguments, conclusions, or documents.
Effective Performance
The level at which an individual or organization successfully meets or exceeds established goals or standards in their work.
Reliable System
A system designed to operate consistently and accurately over time, minimizing errors and failures.
Comparative Evaluation
The process of comparing two or more items or options to assess their relative merits or effectiveness.
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