My first thought was this is indeed a pretty strange question, but then I remember when I was a kid and had only seen stick-shift cars, I had no idea how a car with automatic transmission worked. I thought you would see the “shift lever” moving thru the gears automatically in a car with auto transmission. So here goes –
In a car with manual transmission, you select the gear manually by using your left foot to operate the clutch pedal, and your right hand to control the shift lever. On a bike with manual transmission, you select the gear manually by using your left hand to control the clutch lever, and your left foot to control the shift lever.
In a car/bike with auto transmission, the transmission does the shifting and gear selection for you, so there is no clutch nor shift lever for the operator to control.