The evidence that oxygen levels in the sea increased due to photosynthetic bacteria is best indicated by rust deposits in the ancient ocean. This refers to the presence of iron oxide (rust) in sedimentary rocks, which suggests that free oxygen produced by photosynthetic activities led to the oxidation of iron in the ocean. This oxidation would not have occurred in significant amounts prior to the increase in oxygen levels, thereby indicating the role of photosynthetic bacteria in elevating oxygen in ancient oceans.
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
global cooling
global cooling
rust deposits in the ancient ocean
rust deposits in the ancient ocean
decreases in anaerobic organisms
decreases in anaerobic organisms
1 answer