When Susan visited the Smithsonian Museum of Natural History in Washington D. C., the guide mentioned that many fossils and remains Dinosaurs may have been lost due to natural changes within the earth Using the rock cycle, explain how evidence of prehistoric life may be destroyed.

Asquirrel population lives in an area. over many years, a river in that area grows wider and stronger, eventually forming a canyon. the squirrel populations on the two sides of the canyon can no longer mate with each other and ultimately form distinct species. this is an example of