Why is it difficult to determine the level of exposure to a particular toxic chemical that will cause harm to humans?
What will be an ideal response?
This is difficult to determine because of the many variables involved in estimating the effects of human exposure to chemicals-such as the dose, solubility, and persistence of the chemical.
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) The above map shows the
A) international slave trade in the 17th century. B) British Empire's web of commerce in the late 18th century. C) world-wide spread of industrialization in the 19th century. D) spread of HIV/AIDS in the 20th century. E) Internet connectivity in the 21st century.
Newton showed that differential tidal forces are inversely proportional to the ________ of the distance between the two objects.
A. square root B. first power C. logarithm D. cube E. square
Ozone is beneficial in the stratosphere but harmful in the lower troposphere. Ironically, human activities are causing ozone to
a. decrease in the stratosphere and increase in the lower troposphere b. increase in the stratosphere and decrease in the lower troposphere c. level out to equilibrium in both areas so there is no substantive difference between them d. Human activities are not causing any changes in ozone concentrations anywhere. e. bond with nitrous oxides to form acid rain
Mariculture, or aquaculture, has about the same relationship to commercial fishing as farming does to hunting.
Answer the following statement true (T) or false (F)