The figure below shows what happens in insect populations when crops are sprayed with insecticides.This is an example of ________. 
Definitions:
Bond Indenture
A legal contract outlining the terms and conditions between bond issuers and bondholders, including information such as interest rates and maturity dates.
Debenture Bonds
Financial securities issued by a company that are backed only by the issuer's creditworthiness and general reputation, not by physical assets.
Effective-Interest Method
A method of computing the amortized cost of a bond and of allocating interest expense over its relevant period.
Operating Lease
A lease agreement that allows for the use of an asset but does not convey rights of ownership to the lessee.
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