Paleo- (meaning "ancient" or "old")
* Paleontology: The study of ancient life, especially fossils.
* Paleolithic: The period in human prehistory characterized by the use of stone tools. (Also known as the Old Stone Age)
* Paleoclimatology: The study of past climates.
* Paleoanthropology: The study of the origins and development of humans.
* Paleobotany: The study of ancient plants.
* Paleogeography: The study of the geographical features of the Earth in the past.
* Paleopathology: The study of diseases in ancient populations.
* Paleozoology: The study of ancient animals.
* Paleoenvironment: The environment of the past.
* Paleomagnetism: The study of the Earth's magnetic field in the past.
Other Words:
* Paleo-diet: A diet based on the presumed eating habits of prehistoric humans.
* Paleo-art: Art created by prehistoric humans.
These are just a few examples. The root word "paleo-" can be combined with many other words to create new terms related to the study of the past.