What evidence is there that oxygen levels in the sea increased due to photosynthetic bacteria?(1 point)
Responses
global cooling
global cooling
decreases in anaerobic organisms
decreases in anaerobic organisms
rust deposits in the ancient ocean
rust deposits in the ancient ocean
rust deposits in today’s ocean
rust deposits in the ancient ocean
Which describes the physical weathering of rock by water?(1 point)
Responses
Water breaks down a rock into smaller pieces with the same composition as the larger rock.
Water breaks down a rock into smaller pieces with the same composition as the larger rock.
Water carries away pieces of rock.
Water carries away pieces of rock.
Water dissolves rock into a solution.
Water dissolves rock into a solution.
Any break down of a rock is the same as physical weathering of rock by water.
Water breaks down a rock into smaller pieces with the same composition as the larger rock.
What provides evidence of an increase in animal species at the same time that atmospheric oxygen concentrations increased?(1 point)
Responses
anaerobic organisms
anaerobic organisms
fossil record
fossil record
rust deposits
rust deposits
stromatolites