[matt-attack]

> now contains bacteria, fungi, or other organisms

Whichever types it contains now, surely it started out with :)

[TheCoreh]

Not necessarily. The bacteria might have evolved inside the bottle.

[e12e]

I don't think it is unreasonable to assume some unique mutations in the bacteria? Depends I guess on what (if any) uv and other radiation gets through -- more perhaps than just the number of bacteria generations one would expect in 40 years...