Animals—including humans, dinosaurs, and trilobites—appeared only about 85 percent of the way through Earth's history.
Sources
- Interesting facts about Earth from Harvard paleontologist (news.harvard.edu)
- https://www.journals.uchicago.edu/doi/full/10.1086/721754 (journals.uchicago.edu)
- https://ntrs.nasa.gov/citations/19850024398 (ntrs.nasa.gov)
- https://www.paleosoc.org/assets/docs/Oldest_Fossil.pdf (paleosoc.org)
- https://pmc.ncbi.nlm.nih.gov/articles/PMC4484972 (pmc.ncbi.nlm.nih.gov)
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