Where did life arise and what kinds of life existed at the end of Archean time?
ID: 290636 • Letter: W
Question
Where did life arise and what kinds of life existed at the end of Archean time?
Life in the form of protists may have arisen along mid-ocean ridges, where temperatures were warm, free oxygen was nonexistent, and other conditions were favorable.
Life in the form of fish may have arisen along mid-ocean ridges, where temperatures were warm, free oxygen was nonexistent, and other conditions were favorable.
Life in the form of bacteria may have arisen along mid-ocean ridges, where temperatures were warm, free oxygen was nonexistent, and other conditions were favorable.
Life in the form of fungi may have arisen along mid-ocean ridges, where temperatures were warm, free oxygen was nonexistent, and other conditions were favorable.
Why did relatively little free oxygen accumulate in Earth's atmosphere throughout Archean time?
Such chemical sinks as reduced ions and compounds of sulfur and iron were so abundant that they soaked up nearly all oxygen released by photosynthesis and other chemical processes.
Such chemical sinks as reduced ions and compounds of silica and hydrogen were so abundant that they soaked up nearly all oxygen released by photosynthesis and other chemical processes.
Such chemical sinks as reduced ions and compounds of sulfur and iron were so abundant that they soaked up nearly all carbon dioxide released by photosynthesis and chemical processes.
Photosynthesis and other chemical processes of life on Earth did not evolve until the Proterozoic, so that no free oxygen was present in Earth's atmosphere throughout Archean.
Life in the form of protists may have arisen along mid-ocean ridges, where temperatures were warm, free oxygen was nonexistent, and other conditions were favorable.
Life in the form of fish may have arisen along mid-ocean ridges, where temperatures were warm, free oxygen was nonexistent, and other conditions were favorable.
Life in the form of bacteria may have arisen along mid-ocean ridges, where temperatures were warm, free oxygen was nonexistent, and other conditions were favorable.
Life in the form of fungi may have arisen along mid-ocean ridges, where temperatures were warm, free oxygen was nonexistent, and other conditions were favorable.
Explanation / Answer
1.
along mid ocean ridges with warm temps and no free oxygen it may represent prokaryotes i.e., most primitive forms of cellualr life on earth.
Thereforeoption A matches most.
2. Chemical sinks, in the form of reduced ions and compounds of sulfur and iron were so abundant that they soak up nearly all oxygen released by photosynthesis. As a result the concentration of o2 into the Archean atmosphere remained low. Option 1 is correct answer.
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