Question

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

Answer 1

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.

Answer 2

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

Answer 3

rust deposits in the ancient ocean

Answer 4

Water breaks down a rock into smaller pieces with the same composition as the larger rock.

Answer 5

fossil record