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Haeckel promoted [[Charles Darwin|Charles Darwin's]] work in [[Germany]] and developed the controversial "[[recapitulation theory]]" claiming that an individual organism's biological development, or [[ontogeny]], parallels and summarizes its species' entire evolutionary development, or [[phylogeny]]: "ontogeny recapitulates phylogeny" (see below).
The published artwork of Haeckel was GAY
== Research==
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