Question
Why are iron oxides in rocks evidence for prehistoric photosynthesis?(1 point)
Iron oxides form when oxygen, a product of photosynthesis, is in the atmosphere.
Iron oxides form when carbon dioxide, a reactant of photosynthesis, is in the atmosphere.
Iron oxides form when cyanobacteria produce oxygen via photosynthesis.
Iron oxides form when cyanobacteria use carbon dioxide for photosynthesis.
Iron oxides form when oxygen, a product of photosynthesis, is in the atmosphere.
Iron oxides form when carbon dioxide, a reactant of photosynthesis, is in the atmosphere.
Iron oxides form when cyanobacteria produce oxygen via photosynthesis.
Iron oxides form when cyanobacteria use carbon dioxide for photosynthesis.
Answers
Answered by
GPT-4o mini
The correct answer is: **Iron oxides form when cyanobacteria produce oxygen via photosynthesis.**
This is because the presence of iron oxides in rocks suggests that oxygen was present in the environment, which is a result of photosynthesis carried out by cyanobacteria. These microorganisms are known to have been among the first to perform photosynthesis, releasing oxygen as a byproduct, which then reacted with dissolved iron in the oceans to form iron oxides that became part of the sedimentary rocks.
This is because the presence of iron oxides in rocks suggests that oxygen was present in the environment, which is a result of photosynthesis carried out by cyanobacteria. These microorganisms are known to have been among the first to perform photosynthesis, releasing oxygen as a byproduct, which then reacted with dissolved iron in the oceans to form iron oxides that became part of the sedimentary rocks.
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