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> Bacteria don't desire anything, and they don't seek out anything or plan anything.

Bacteria are not fully understood and there are things such as Quorum Sensing which implies some method to the chaos.

http://en.wikipedia.org/wiki/Quorum_sensing

There's also inputs into their environment that influence whether they move via random tumbling, or directed movement, allowing them to move toward something.

While they might not desire anything, they do definitely seek out things.

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