(Science: pharmacology) A chemical which is used to kill unwanted organisms such as rats, insects, nematodes, etc.

pesticides often act as nerve poisons, and they are hazardous to animals and humans (some pesticides can cause nerve or liver damage, birth defects and cancer).

See: [[biological Magnification and herbicide]]. A chemical used to kill pests (as rodents or insects).A type of chemical that causes harm to the health of so called 'pests'.

The concentration of pesticides is much greater in the organisms that eat the plants sprayed in pesticide. The concentration of pesticide becomes larger as you move further up the food chain.

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