Question
What evidence is there that oxygen levels in the sea increased due to photosynthetic bacteria?(1 point)
Responses
rust deposits in today’s ocean
rust deposits in today’s ocean
decreases in anaerobic organisms
decreases in anaerobic organisms
rust deposits in the ancient ocean
rust deposits in the ancient ocean
global cooling
Responses
rust deposits in today’s ocean
rust deposits in today’s ocean
decreases in anaerobic organisms
decreases in anaerobic organisms
rust deposits in the ancient ocean
rust deposits in the ancient ocean
global cooling
Answers
GPT-4o mini
The best evidence that oxygen levels in the sea increased due to photosynthetic bacteria is **rust deposits in the ancient ocean**.
These deposits, known as banded iron formations (BIFs), are believed to have formed when dissolved iron in the sea oxidized as oxygen produced by photosynthetic cyanobacteria entered the ocean. This indicates that there was a significant increase in oxygen levels due to photosynthesis.
These deposits, known as banded iron formations (BIFs), are believed to have formed when dissolved iron in the sea oxidized as oxygen produced by photosynthetic cyanobacteria entered the ocean. This indicates that there was a significant increase in oxygen levels due to photosynthesis.