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2. Where did most of the water that fills Earth's oceans probably come from?
A. photosynthesis by cyanobacteria
B. melting of glaciers
C. water vapor from volcanic eruptions
D. water vapor from meteorite impacts

3. What did Franic Crick and Leslie Orgel discover about the chemicals needed for life to form?
A. Amino acids could be formed from matter present on early Earth.
B. RNA can act as an enzyme and plays a role in the formation of proteins.
C. Cells can be created in a test tube from simple inorganic materials.
D. Earth's early atmosphere was toxic to modern organisms.

4. Land plants first evolved about half a billion years ago. How did the appearance of land plants on Earth affect other organisms?