Which of the following statements regarding migration and settlement of African Americans in the United States is most accurate?
A) In 1900, about half of African Americans lived in the South; today that figure remains the
same.
B) In 1900, more than 70% of African Americans lived in the South; today about one-third of
them live there.
C) In 1900, more than 90% of African Americans lived in the South; today a little more than
half of them live there.
D) In 1900, about half of African Americans lived in the South; today about 90% of them live
there.
E) In 1900, more than 90% of African Americans lived in the South; today that figure remains
the same.
C) In 1900, more than 90% of African Americans lived in the South; today a little more than
half of them live there.
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Most marine organisms have the same body temperature and salinity as the surrounding environment. Why?
Regarding hydrostatic equilibrium and movements toward hydrostatic equilibrium, it is true that:
A) upward vertical movements are likely to occur more rapidly than downward movements. B) air density has no effect on the up or down motion of air masses. C) a sparse atmosphere feels a stronger gravitational pull than does a dense atmosphere. D) the vertical pressure gradient force is no match for the force of gravity.
The current (2017) human population is about
A. 7.5 billion. B. 10 billion. C. 4 billion. D. 4.6 billion.
The ________ day is the time it takes for Earth to make one complete rotation with respect to a star other than our Sun
A) sidereal B) equinox C) Julian D) synodic E) zodiacal