The best answer would be "research reasons why species change over long periods of time"
if not i apologize but this is my best guess<span />
The remains or impression of a prehistoric organism preserved in petrified form or as a mold or cast in rock.
Mold fossils
Cast fossils
Trace fossils
O D the seasonal movement of organisms between locations mark me as brilliants
Becuase you will get the species mixed up
