Persistent pesticides are more toxic than nonpersistent pesticides and must be handled with greater care.
Answer the following statement true (T) or false (F)
False
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Which of the following best matches the description?Attached organisms in freshwater streams and rivers.
A. deciduous forest B. periphyton C. benthic D. marsh E. phytoplankton F. pioneer community G. boreal forest H. biochemical oxygen demand I. desert J. euphotic K. littoral zone L. savanna M. tundra N. grassland O. pelagic
China is the world leader in grain and feed production
Indicate whether the statement is true or false
How do the strength and cohesion of clay-rich regolith or soil change with the addition of water?
A) Water reduces the strength of clays but raises the cohesion of the soil. B) Water increases the strength and cohesion. C) Water lowers the strength and cohesion. D) Water does not affect the cohesion but lowers the strength.
The "precautionary principle" in international law
A. gives the United Nations the authority to impose sanctions against nations whose actions may be harmful. B. allows for restriction of countries' activities before irrevocable harm has been documented. C. requires all nations to cease producing and releasing pollutants. D. All of the choices are correct.