In the history of biology, preformationism (or preformism) is a formerly-popular theory that organisms develop from miniature versions of themselves. Instead of assembly from parts, preformationists believed that the form of living things exist, in real terms, prior to their development. It suggests that all organisms were created at the same time...
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http://en.wikipedia.org/wiki/Preformationism
(Lat. pre + formare, to form before) The doctrine, according to which, the organs and hereditary characters of living creatures are already contained in the germ either structurally or by subsequent differentiation. Cf. Leibniz (q.v.) (Monadology, sect. 74) who was influenced by Leeuwenhoek's microscopic discoveries and theory of the homunculus (l....
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https://www.encyclo.co.uk/local/21203
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