> I'd be willing to bet that there is a healthy species of bacteria that has stopped evolving, that perfectly copies its dna when it divides, and never transfer

> I'd be willing to bet that there is a healthy species of bacteria that has stopped evolving, that perfectly copies its dna when it divides, and never transfers dna horizontally There are several flaws in your argument: 1) There is no known polymerase that has a fidelity of 100%. There will always be some number of replication errors when DNA is synthesized. 2) There are lots of mutagens in the environment. UV light, mutagenic chemicals, hell, even radioactive decay of mostly-stable elements will occasionally hit a base and cause a mutation. So, no, there is certainly no species that meets your criteria for non-evolving.