[struwwelpeter]

Any dermatologist or internist understands the concept of "internal flora", whereby bacteria live symbiotically and cooperatively.

[gore3000]

Any dermatologist or internist understands the concept of "internal flora", whereby bacteria live symbiotically and cooperatively.

That something happens, does not mean it is evolution. What we have this is much more than symbiosis, it is working towards a goal and exchange of information.