A record based on preserves past lives on Earth and is the only source of knowledge, currently, for what used to be alive. 

Arizona State University

Fossils are the remains of animals and plants that have been buried and preserved in sediments such as mud and sand, under ancient rivers, lakes, or seas. Traces of life that are preserved as fossils are typically at least 10,000 years old.

Fossils

Shook, B., Nelson, K., Aguilera, K., & Braff, L. (2019). *Explorations: An Open Invitation to Biological Anthropology*. American Anthropological Association Arlington. 978-1-931303-62-0

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