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8. Which of the following contributed most to the intense heat of the Hadean eon?
A. Clouds of carbon dioxide, hydrogen, and other gases
B. Frequent collisions with asteroids and meteorites
C. Lightning strikes and volcanic eruptions
D. Closer proximity to the sun than is now the case
9. In the lipid membrane hypothesis, it is proposed that liposomes
A. formed in chimney-like structures at ocean hydrothermal vents.
B. were the result of lightning striking early Earth.
C. acted as barriers between organic molecules and the environment.
D. served as the genetic material on early Earth.
10. Which of the following hypotheses proposes that early organic molecules formed near ocean hydrothermal vents?
A. Iron-sulfide bubbles hypothesis
B. Lipid membrane hypothesis
C. RNA world hypothesis
D. Meteorite hypothesis
A. Clouds of carbon dioxide, hydrogen, and other gases
B. Frequent collisions with asteroids and meteorites
C. Lightning strikes and volcanic eruptions
D. Closer proximity to the sun than is now the case
9. In the lipid membrane hypothesis, it is proposed that liposomes
A. formed in chimney-like structures at ocean hydrothermal vents.
B. were the result of lightning striking early Earth.
C. acted as barriers between organic molecules and the environment.
D. served as the genetic material on early Earth.
10. Which of the following hypotheses proposes that early organic molecules formed near ocean hydrothermal vents?
A. Iron-sulfide bubbles hypothesis
B. Lipid membrane hypothesis
C. RNA world hypothesis
D. Meteorite hypothesis