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What killed off much of the explosion of life following the Cambrian "explosion"?

Prior posts have discussed the Cambrian explosion, and noted the evidence suggesting that it was a more gradual process than stereotypically described. However, there has been little solid evidence to explain why, following this alleged burst of complex life, a substantial extinction set in. As with...

Do comb jellies indicate that evolutionary theory needs a serious rethink? Maybe instead they are a door to understanding the evolution of complexity

When viewing evolution over time, scientists generally favor parsimony, that is, lineages radiating from a common ancestor share most of the ancestor's features. This also means that animals at the bottom have simple features, which may grow more complex or which may become more specialized as other...