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.
Water's Covalent Bonds Are Polar
The Morris Water Maze
Large water tank, possibly a public or ritual bathing area, from Mohenjo-daro, Indus Valley ...
Distribution of Earth's Water
Planet Earth compared to all its water and air!