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Parameter Tree:
EARTH SCIENCE > BIOSPHERE > ECOLOGICAL DYNAMICS > ECOTOXICOLOGY > TOXICITY LEVELS
Definition:
A property whereby substances are injurious to health when ingested or
inhaled, such as chlorine, ammonia, pesticides, and formaldehyde. 
Reference:
Nebel, Bernard J.and Richard T. Wright. Environmental Science-the Way the World
Works. 1998. Prentice-Hall, Inc. Upper Saddle River, New Jersey.
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