When did Horizon Season 18 Episode 12 air?
Horizon Season 18 Episode 12 aired on March 30, 1981.


Horizon tells amazing science stories, unravels mysteries and reveals worlds you've never seen before.
In this episode, Horizon explores the new evolutionary theory that there are sudden, vs. gradual, evolutionary changes from one species to another.
Direct answers for episode-level questions and details.
Horizon Season 18 Episode 12 aired on March 30, 1981.
This episode runs for approximately 60 minutes.
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