On: There are no pure cultures – we have always been global

[Jensson]

> all we need to do to disprove this claim is present one pure culture.

Define "pure culture". This seems to be mostly different interpretations about what that means.

If someone says that no water is pure so this polluted water is fine, that is a fallacy.

[alganet → Jensson]

I can't define what "pure culture" is. I've never seen one.

The people claiming that pure cultures exist that must try to define it. The onus is on them, not me.