Haeckel, Ernst


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Haeckel,

Ernst, German naturalist, 1834-1919.
Haeckel gastrea theory - that the two-layered gastrula is the ancestral form of all multicellular animals. Synonym(s): gastrea theory
Haeckel law - the theory that ontogeny is an abbreviated recapitulation of phylogeny. Synonym(s): recapitulation theory