Dijo Zing-yang Kuo:

"The Behavior of animal and man is a continuous stream of activity from fertilization to death. In such a continuous process of energy exchange between the organism and the environment, behavior never comes to an end. If there is an end in behavior, that end must be death for death is the end of all ends."

Sorry... no hay retratos en la red de Kuo... si alguien la encuentra avísenme pa' subirla... gracias.