Answer: bones, coal, wood, teeth, leaves, shells, etc.
Step-by-step explanation:
Fossils are preserved remains of pre-existing living organisms that existed during previous geologic age (4.5 billion years).
The study of fossils including their age, mode of formation, evolutionary trend, etc is known as paleontology. In fossils, either parts or the entire part of an organism can be preserved, which can either be small or large.