The beginning of the Paleozoic is marked by the emergence of
A) organisms with hard parts.
B) fish and fungi.
C) extensive glaciated deposits.
D) none of these
Answer: A
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When considering the number of technologically advanced civilizations in our Galaxy, it is useful to consider
a. the average life span of an alien. b. the average life span of the civilization. c. the distance to the civilization's planet. d. the type of advanced communication they use.
Whether one object is warmer than another object has most to do with molecular
A) kinetic energy. B) potential energy. C) masses.
Which of the following locations has the smallest (in magnitude) magnetic declination?
a. Washington state b. the South Carolina – Georgia border c. the San Francisco – Oakland area d. western Colorado
What is the magnitude of the momentum of a proton moving at 0.95 c? 
A. 
B. 
C. 
D. 
E. 