Origin of Haeckel's law
"Haeckel\'s law." YourDictionary, n.d. Web. 15 January 2019. <https://www.yourdictionary.com/haeckel-s-law>.
Haeckel\'s law. (n.d.). Retrieved January 15th, 2019, from https://www.yourdictionary.com/haeckel-s-law
See biogenetic law
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