In order for life to originate,plants need __________ for a long enough period.
A) amino acids on the surface
B) oxygen in the atmosphere
C) carbon dioxide in the atmosphere
D) liquid water on the surface
Correct Answer:
Verified
Q20: A mineral that commonly encrusts microbes living
Q21: The Gunflint Formation preserves _-year-old microfossils similar
Q22: The boundaries of the Phanerozoic are marked
Q23: Microbes were the only organisms on Earth
Q24: _ record the presence of microbial mats
Q26: The impact site for the giant Cretaceous-Tertiary
Q27: Photosynthesis became an important metabolic process approximately
Q28: Sedimentary features that form from the interaction
Q29: When organisms are no longer able to
Q30: A rise in ocean temperatures can cause
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