Convoluted phylogenetic trees, seemingly required by the genetic data, suggest that highly complex biological structures have been gained and lost many times in evolutionary history.
Add this to the growing pile of improbable causes for complex body plans: volcano heat.
Which dataset are we to trust?
The Cambrian explosion isn’t the only explosive event in the fossil record that disturbed Charles Darwin.
It arises each night from its coffin. It cannot be killed by any natural means. By now, it has extremely bad breath.