What determines the entropy of a biological system?

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Entropy measures how many microscopic arrangements a system can have at a given energy. When molecules are highly ordered, there are few possible configurations, so entropy is low. When they are disordered, there are many possible configurations, so entropy is high. In biological systems, the amount of molecular order directly sets how many states the system can explore, making the degree of order the best predictor of entropy. Temperature and volume change the number of accessible microstates, but they do so by altering energy distribution or space, not by defining the level of organization itself; the number of cells does not determine the thermodynamic entropy of the system.