Fossils are the remnants of tools and other things used by ancient civilizations in everyday life.

Well it depends if you mean animal fossils or dinosaur fossils so it actually depends on which one you mean like if you mean animal fossils ancient civilizations did used animal fossils in the past because they had to use them to survive like for example the Buffalo ancient civilizations use the Buffalo because it had a pointy horns and the use the horns for weapons and the use the buffalo skin to make their clothing so yeah if you mean animal fossils ancient civilizations did use animal fossils.