Some people become alarmed when they learn that the water they drink contains known carcinogens. These concerned people
A) are rightly alarmed, because all municipal drinking water should be free of any carcinogens.
B) should be somewhat alarmed but might be comforted by knowing that some of these carcinogens are known to cause cancer only in mice.
C) should know that it is the concentration, and not the presence of carcinogens, that is of greatest concern.
D) should not be concerned, because it is the combination of carcinogens, and not the presence of any one carcinogen, that poses a health risk.
Question 2
To maintain steady total populations in future decades, most European countries will need to
A) decrease fertility rates.
B) increase their total fertility rate and/or accept more immigrants.
C) encourage emigration.
D) encourage the use of birth control.
Upward transport of water in xylem.
Water Potential, Solute Potential, and Pressure Potentia
Water Gradient
Most Americans obtain their drinking water from a community water system
Water CO2
Storm water charge