Analysis of information sources in references of the Wikipedia article "History of speciation" in English language version.
One of his greatest anxieties was that the "incompleteness" of the fossil record would be used to criticize his theory: that the apparent "gaps" in fossil succession could be cited as negative evidence, at the very least, for his proposal that all organisms have descended by minute and gradual modifications from a common ancestor.
The near-simultaneous appearance of most modern animal body plans in the Cambrian explosion suggests a brief interval of rapid phenotypic and genetic evolution, which Darwin believed were too fast to be explained by natural selection.
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: CS1 maint: multiple names: authors list (link)The near-simultaneous appearance of most modern animal body plans in the Cambrian explosion suggests a brief interval of rapid phenotypic and genetic evolution, which Darwin believed were too fast to be explained by natural selection.
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