It was agreed by all European evolutionists that all vertebrates looked very similar at an early stage, in what was thought of as a common ideal type, but there was a continuing debate from the 1820s between the Romantic recapitulation theory that human embryos developed through stages of the forms of all the major groups of adult animals, literally manifesting a sequence of organisms on a linear chain of being, and Karl Ernst von Baer's opposing view that the early general forms diverged into four major groups of specialised forms without ever resembling the adult of another species, showing affinity to an archetype but no relation to other types or any transmutation of species.
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One critic of Wells said " If one reads Wells'criterion for his bogus A & ndash; F grading scale for the textbooks in Icons, it quickly becomes apparent that even publishing illustrations that resemble Haeckel's to illustrate his folly will garner the book a D, the only difference between a D and an F in Wells'mind being a'D'grade book selecting a few embryos rather than publishing the full swath Haeckel originally doctored . " PZ Myers says of Wells's claim about the use of Haeckel drawings in modern textbooks " They repeat the claim that Haeckel's embryos and all that silly recapitulation theory are still endemic in biology textbooks.
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