Which of the following describes a fundamental difference between Earth's climate history and the climate histories of Venus and Mars?
A) Earth's climate has remained relatively steady throughout our planet's history.
B) Earth got a lot of atmospheric gas from outgassing by volcanoes.
C) Earth had enough water to form oceans in its early history.
D) Earth's climate can be affected by changes in its axis tilt.
A) Earth's climate has remained relatively steady throughout our planet's history.
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Coulomb's Law: A small charged plastic ball is vertically above another charged small ball in a frictionless test tube as shown in the figure. The balls are in equilibrium a distance d apart. If the charge on each ball is doubled, the equilibrium distance between the balls in the test tube would become
A. 
d.
B. 2d.
C. 4d.
D. 8d.
E. d/4.
Which of the following is not key evidence in support of the idea that all life today shares a common ancestor?
A) Mapping of gene sequences shows how life is all related. B) All life builds proteins from the same amino acids and uses ATP to store energy in cells. C) We have identified fossils of the first life forms that ever existed on Earth. D) All life uses DNA and the same genetic code.
In the BCS theory of superconductivity of metals, at temperatures below the critical temperature electrons are coupled into _________pairs through interactions with the crystal lattice.
Fill in the blank(s) with the appropriate word(s).
The length of your arm is closest to
A) 10 centimeters. B) one meter. C) one kilometer. D) 100 meters. E) two meters.