Final answer:
Living organisms maintain the organization of their internal systems through constant energy input.
Step-by-step explanation:
Living organisms maintain the organization of their internal systems through constant energy input. As living systems take in energy-storing molecules and transform them through chemical reactions, they lose some amount of usable energy in the process. This process increases the entropy of the system's surroundings. Therefore, to prevent death and maintain their organization, living organisms require a continuous supply of energy.