Here's why:

* Fossils are the preserved remains of ancient life. This typically includes bones, teeth, shells, or even traces of organisms like footprints.

* Arrowheads are artifacts. They are objects made by humans and represent a tool or weapon from the past. They are not the remains of any living thing.

While arrowheads are often found in archaeological digs alongside fossils, they are considered a different category of historical evidence.