Using ZOOM on a Mac Mini without a microphone

I have a Mac Mini that does NOT have a microphone. I cannot choose a "microphone" when Zoom asks me to select the speaker and microphone for the particular zoom session. The zoom video opens without any problem but I do not get the audio of this particular zoom session or any zoom session.

I cannot find any option on the zoom settings to eliminate a microphone if there is not a microphone available on the computer.