Question

A group of paleobiologists were studying sedimentary rocks in the Rocky Mountains of North America. What order of organisms would they find in the layers of these sedimentary rocks?
A-All organisms are arranged randomly in the layers of sedimentary rocks.
B-Newest organisms are at the bottom and the oldest organism is in the top-most layer of the sedimentary rocks
C-Oldest organisms are at the bottom and the newest organism is in the top-most layer of the sedimentary rocks.