The diffusion constant for oxygen through water is 
What is the time for an oxygen molecule to diffuse 1 cm?
a. 
b. 
c. 
d. 
e. 
d.
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Which of the following is true of Saturn's moon Enceladus?
A) It is rich in organic molecules. B) It has been warmed by tidal heating. C) It has plentiful liquid water necessary for the rise of life. D) It is airless so any form of water would boil away into space.
In materials like glass or water, the speed of light is ________.
A. increased B. reduced C. the same as in a vacuum D. sometimes reduced and sometimes increased
Wave energy can only be transmitted through a material medium
Indicate whether the statement is true or false
Galileo challenged the idea that objects in the heavens were perfect by ________
A) observing sunspots on the Sun and mountains on the Moon B) inventing the telescope C) proving Kepler's laws were correct D) showing that heavy objects fall at the same rate as lighter objects