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

Physics & Space Science

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a.
b.
c.
d.
e.

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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?

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Currently, most of the mass of the matter of the universe is believed to consist of:

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Much of the charge on a conducting cube is

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Physics & Space Science