If the material for life were introduced from space after the Earth formed, a major carrier would have been:
A) the solar wind.
B) tektites from the Moon.
C) comet impacts.
D) encounters with other solar systems.
E) iron meteorites.
Question 2
Under which circumstances can you be sure that the thermal pressure within a gas cloud is increasing?
A) The cloud's temperature and density are both increasing.
B) The cloud's temperature is increasing and its density is decreasing.
C) The cloud's temperature and density are both decreasing.
D) The cloud's temperature is decreasing and its density is increasing.
E) It is impossible to say.
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