Answer the following question given this paragraph: 

Fossils may form in other ways. With complete preservation, the organism doesn't change much. As pictured below ( Figure below ), tree sap may cover an organism and then turn into amber . The original organism is preserved so that scientists might be able to study its DNA. Organisms can also be completely preserved in tar or ice.


Q: Tree sap enclosing an organism in amber or an organism preserved in tar or ice are actually examples of what?

 Choices:

- bones

- corals

- fuels

- fossils

A:
fossils
