Definition: Based on the information present in the given passage, you need to write a correct answer to the given question. A correct answer is one that correctly and completely answers the question. Do not write answers that address the question partially or incorrectly. The correct answer must be contained in the given paragraph.
Input: Paragraph- Sent 1: Fossils may form in other ways.
Sent 2: Fossils can be preserved almost completely.
Sent 3: In this process, the organism doesnt change much.
Sent 4: As seen below, tree sap may cover an organism.
Sent 5: With time, the sap hardens.
Sent 6: It turns to into amber.
Sent 7: The original organism is preserved.
Sent 8: This is very exciting for scientists.
Sent 9: They are able to study the DNA of the organism that no longer lives on Earth.
Sent 10: Some animals have been found frozen in ice.
Sent 11: Others have been found in tar pits after falling in.
Sent 12: Molds and casts are another way organisms can be fossilized.
Sent 13: Have you ever walked in soft mud and left footprints?
Sent 14: Once in a while, these traces of organisms can be preserved.
Sent 15: In this case, nothing is left of the organism.
Sent 16: A mold is an imprint of an organism that is preserved in rock.
Sent 17: The organisms remains break down completely.
Sent 18: There is nothing left of the original plant and animal. 
Question: How is amber made?.
Output:
Tree sap covers an organism, and then it hardens over time.