Question

Earth's Processes: Weathering and Erosion Unit Test
8 of 158 of 15 Items





































Question
What provides evidence of an increase in animal species at the same time that atmospheric oxygen concentrations increased?(1 point)
Responses

rust deposits
rust deposits

stromatolites
stromatolites

anaerobic organisms
anaerobic organisms

fossil record

Answer 1

The correct response is **fossil record**. The fossil record provides evidence of an increase in animal species corresponding with increased atmospheric oxygen concentrations. As oxygen levels rose, it allowed for more complex life forms to thrive.