Question: The rock has been dated to 2.5 billion years old. What does the presence of the red bands indicate about the evolution of photosynthetic organisms,
The rock has been dated to 2.5 billion years old. What does the presence of the red bands indicate about the evolution of photosynthetic organisms, such as cyanobacteria, and eventual oxygenation of the Earth's atmosphere? Group of answer choices The Earth's atmosphere was beginning to oxygenate by 2.5 billion years ago. The Earth's atmosphere was began to oxygenate long after 2.5 billion years ago. The red bands provide no information related to the presence of oxygen in the Earth's atmosp
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