What provides evidence of an increase in animal species at the same time that atmospheric oxygen concentrations increased?(1 point) Responses stromatolites stromatolites fossil record fossil record rust deposits rust deposits anaerobic organisms
1 answer
The correct answer is stromatolites. Stromatolites are layered sedimentary structures formed by the trapping and binding of microorganisms, including early forms of bacteria and algae. They are commonly found in ancient rock formations and provide evidence of early life on Earth. Stromatolite formations have been found to coincide with periods of increased atmospheric oxygen concentrations, indicating a connection between increased oxygen and the proliferation of animal species.