Is a river an abiotic or biotic factor

Is a river abiotic or biotic? A river is an abiotic factor.

Why? A biotic factor is anything living or used to be living while a biotic factor is something that is nonliving and was always non-living like a rock.  

i would say the prokaryotic cells the prokaryotic cells are less complex, are usually found only in unicellular organisms and have more limited capabilities than eukaryotic cells.

i think its control and coordinate because im pretty sure thats what tissue does and the joints are what control movement and then your skeletal/ bones provides portection. hope that .