Final answer:
Fossils are the preserved remains or signs of ancient organisms. They provide valuable information about past life forms and their evolution.
Step-by-step explanation:
Fossils are the preserved remains or signs of ancient organisms. They are formed when the hard parts of an organism, such as bones, teeth, or shells, mineralize over time. Fossils can provide scientists with important information about past life forms and their evolution. Examples of fossils include complete skeletons, bones, and impressions.