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References

https://naturalhistory.si.edu/education/teaching-resources/life-science/early-life-earth-animal-origins

Music by

Unfriendly Me by Martijn de Boer (NiGiD) (c) copyright 2015 Licensed under a Creative Commons Attribution Noncommercial (3.0) license. http://dig.ccmixter.org/files/NiGiD/48712 Ft: Admiral Bob

and

Drops of H2O ( The Filtered Water Treatment ) by J.Lang (c) copyright 2012 Licensed under a Creative Commons Attribution (3.0) license. http://dig.ccmixter.org/files/djlang59/37792 Ft: Airtone