Which was a main force driving extensive speciation when the environment became hospitable to life after the Permian mass extinction? A. increase in available ecological niches
B. increase in genetic diversity among surviving organisms

What evidence for the age of the earth is indicated by the fact that sedimentary rock is found on mountain tops? that the earth has expanded outward from water beds that mountains formed first before anything else that some force lifted the rocks from the water the earth is not very old and has not had time for many rock layers to form