It postulated that the main evolutionary mechanism was symbiosis — mutually beneficial organisms grow together to become one organism that reproduces itself.

It's evidence of gene duplication and subsequent divergence, a common evolutionary mechanism.

That wellestablished evolutionary mechanism, whereby natural selection works at the level of the group not just the individual, perfectly explains the bats' behaviour - without invoking kindly bats.

One modern version of the theory has invoked the evolutionary mechanism of group selection in order to explain the apparent genetic-based task specialization of shamanism.

The book discussed how the evolutionary mechanisms that drove speciation could also explain the differences between higher taxa.