the oldest prokaryotic fossils have been dated:

It's a message that evolution is giving us: Cooperation is a way to get ahead. Geological Society Special Publications. There are still many bacteria today that cannot live in the presence of oxygen. Canalisation Evolutionary developmental biology Genetic assimilation Inversion Modularity Phenotypic plasticity. Briggs, Derek E. Captorhinidae and Protorothyrididae extinct. Cell membranes are typically bounded by a cell wall and motility is achieved using one or more flagellar tail structures.

THE OLDEST PROKARYOTIC FOSSILS HAVE BEEN DATED: / morphy.info

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