Can OS X start (and stop) bash by itself?

A little earlier I noticed some data coming in to my Mac over the internet, perhaps a couple of megabytes, which is not unusual in itself, but I checked in Activity Monitor at that moment, and saw that bash was running and then quit moments after the data ceased coming in. I have not seen this before, yet have many times observed which processes are running.
Knowing very little of computer science or the use of shells, I felt it best to ask of someone who knows for sure, and so am humbly doing so here.
Will

Applications and other running processes sometimes create shells or faceless background processes as part of their normal operation, which exit after whatever task is done. If you click on the Inspect button for it, you may find out more details about what it's being used for.
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Can OS X start (and stop) bash by itself?

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