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61-ME4211 - 3 Ecotoxicity Definition Goal Ecotoxicology is...

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3. Ecotoxicity 1 Definition & Goal Ecotoxicology is the study of how chemicals affect the environment and the organisms living in it. There is a web of life . Understand the concentration of chemicals at which organisms in the environment will be affected . To determine the possibility that a chemical is toxic- start with simple approaches. The process is referred to as the "tiered effects process."
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Chemicals emitted as a consequence of human activities contribute to ecotoxicity if they affect the function and structure of the ecosystems by exerting toxic effects on the organisms, which live in them. If the concentrations of environmentally hazardous substances caused by the emission are high enough , the toxic effects can occur as soon as the substances are released . This form of toxic effect is called acute ecotoxicity . It often results in the death of organisms exposed. 2
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Toxic effects which are not acutely lethal and which first appear after repeated or long-term exposure
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