
1) Biology-themed board game 2) Early life, some say 3) Evolutionary starting point
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https://www.crosswordclues.com/clue/primordial-soup
[board game] Primordial Soup is a board game designed by Doris Matthäus & Frank Nestel and published by Z-Man Games. It was first published in 1997 in Germany by Doris & Frank under the name Ursuppe and this original version won 2nd prize in the 1998 Deutscher Spiele Preis. ==Theme== Each player guides a species of primitive amoeba driftin...
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http://en.wikipedia.org/wiki/Primordial_Soup_(board_game)

`Primordial soup` is a term introduced by the Soviet biologist Alexander Oparin. In 1924, he proposed a theory of the origin of life on Earth through the transformation, during the gradual chemical evolution of molecules that contain carbon in the primordial soup. Biochemist Robert Shapiro has summarized the `primordial soup` theory of Oparin ...
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http://en.wikipedia.org/wiki/Primordial_soup

the seas and atmosphere as they existed on earth before the existence of life, consisting primarily of an oxygen-free gaseous mixture containing chiefly water, hydrogen, methane, ammonia, and carbon dioxide. · a laboratory preparation containing the substances believed to have composed primordial soup, and used in experiments seeking to und...
Found on
https://www.infoplease.com/dictionary/primordial-soup
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