Final answer:
Skeleton is not a trace fossil.
Step-by-step explanation:
In the given options, skeleton is not a trace fossil.
Trace fossils are evidence of the activities of ancient organisms, such as footprints, teeth marks, and animal burrows. These fossils provide valuable information about the behavior and interactions of organisms in the past. However, a skeleton is not considered a trace fossil because it represents the preserved remains of an organism's body.
Learn more about Trace fossils