Principal Exclusion Principal 
The principal states that no two organisms can exploit the same niche at the same time. One can see this in the way that Adenosine is bullied and abused by Charaf (seen stomping on Adenosine's back). The two turtles are both trying to live in the same tank and live off of the same food pellets at the same time, because of this there is competition. Clearly Charaf is the better sued animal, and if it weren't for the deliberate feeding of Adenosine by you (Ms.Maddox) and other class mates, Adenosine; as the principal implies... would surly die.