Why do scientists suspect that life first arose near deep-sea volcanic vents or similar environments with abundant chemical energy?
A) A deep ocean environment would have protected early organisms from ultraviolet radiation before the formation of the ozone layer.
B) All organisms have similar DNA, with further relations having greater differences.
C) The chemical pathways for extracting energy from chemicals in vents are simpler than photosynthesis.
D) A and B
E) A and C
F) A, B, and C
E
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Much of the charge on a conducting cube is
A) uniformly spread over its surface. B) partly beneath the surface. C) mutually repelled toward its corners. D) none of the above
What is the magnetic energy density in a volume where the magnetic field is 4.0 mT?
a. 
b. 
c. 
d. 
e. 
Currently, most of the mass of the matter of the universe is believed to consist of:
A) baryonic matter, made up of protons and neutrons. B) tachyonic matter, travelling only faster than the speed of light. C) dark matter not made of protons and neutrons. D) dark energy. E) tiny but very numerous black holes.
Suppose you are head of NASA two decades from and have to make some budget cuts. Your agency has been planning four different missions to search for life in the solar system, and you need to cancel the least promising one. Which one do you cancel?
A) a mission to dig beneath an ancient Martian river bed B) a mission to explore the ice geysers of Saturn's Moon Enceladus C) a mission designed to plunge deep beneath Jupiter's cloud layers D) a mission to drill through the icy surface of Jupiter's Moon Europa