The age structure of a population is the number or percentage of
a. females under reproductive age
b. females at reproductive age
c. males age 15 to 44
d. persons of each sex in young, middle, and older age groups
e. persons of each sex age 15 to 44
D
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What prompted the first widespread mapping of the ocean floor?
a) The sinking of the Titanic b) he creation of NASA c) The importance of submarine warfare during World War II d) The laying of undersea telegraph lines between the United States and Europe e) Conflicts over maritime (ocean) territorial claims during the 1970s
When the Sun is active (e.g. more sunspots and eruptions), the thermosphere increases in size
Indicate whether the statement is true or false
Which of the following is true of the relationship between thiols and disulfides?
A) Thiols are easily oxidized to disulfides, and disulfides are easily reduced to thiols. B) Thiols are not easily oxidized to disulfides, and disulfides are not easily reduced to thiols. C) Thiols are easily oxidized to disulfides, but disulfides are not easily reduced to thiols. D) Thiols are not easily oxidized to disulfides, but disulfides are easily reduced to thiols.
Which kind of health effect occurs after a single exposure to a toxic substance?
a. Somatic b. Acute c. Severe d. Chronic