Arrowheads are important artifacts that tell us about the past. An artifact is an item that was created by humans

Arrowheads are important artifacts that tell us about the past. An artifact is an item that was created by humans from an earlier time and was used for a certain purpose. An arrowhead, like the name suggests, is the tip of an arrow. Ancient people carved arrowheads out of stone and bone.
Archaeologists, scientists that study artifacts, sort arrowheads by the dates they were made and by the name of the group of people who made them. Archaeologists use point typologies to date and label arrowheads. A point typology is an arrowhead that shows an example of the size and shape of arrowheads from a certain region. Other arrowheads can be compared to point typologies to determine which group may have made them and when. When an arrowhead is named as a certain point typology, the archaeologists know that a certain group of people probably lived in the area where the arrowhead was found.
Arrowheads provide important information about history. About four decades ago, the discovery of an arrowhead in Driggs, Idaho gave new evidence about that area. The arrowhead was dated back to over 10,000 years ago. The size and shape of this arrowhead connect it to the Clovis period. The Clovis people are thought to be the earliest people to have a permanent settlement in North America. They most likely stayed there because of the availability of food. Before the arrowhead was discovered, no one knew that the Clovis people had lived there. Now, archaeologists are searching for more artifacts in that area. Arrowheads can us find out a lot of information about the past.What is the main reason why the author includes the definition of artifact in the passage?

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