Final answer:
A complex system does not have to be adaptive to be of interest in the field of complexity. A crystal lattice is an example of a complex system that is not adaptive.
Step-by-step explanation:
A complex system does not necessarily have to be adaptive to be of interest in the field of complexity.
Complexity as a discipline examines complex systems and how they adapt and evolve, but there are examples of complex systems that are not adaptive.
One example is a crystal lattice, which is a highly ordered and repeating pattern of atoms or ions.
Crystal growth is an example of self-organization, but it does not involve adaptability.