The biological and evolutionary ideas of Ernst Haeckel, particularly his theory that individual development mirrors evolutionary history.
From Haeckel + -ism (a system of ideas or beliefs). Haeckelism includes his version of the biogenetic law and his broader evolutionary philosophy.
Haeckelism was so popular it became a cultural movement—Haeckel was a celebrity scientist whose ideas inspired art, architecture, and design beyond just biology, though modern science rejected many of his claims.
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