Analysis of information sources in references of the Wikipedia article "종분화의 역사" in Korean 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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