Dynamic equilibrium exists when:

Dynamic equilibrium refers to a state in which different elements of a system interact in such a way that their opposing forces are balanced. This balance allows the system to maintain stability, despite ongoing processes and changes. In a state of dynamic equilibrium, while changes may be occurring within the system, they do not lead to net changes that would disturb the overall stability.

For example, in ecological systems, different species might interact through predator-prey relationships, and while populations may fluctuate, overall balance can be achieved where predator and prey populations sustain one another. This is indicative of dynamic equilibrium—a dynamic, yet stable state.

The other options do not accurately characterize dynamic equilibrium. A system that remains unchanging over time would be in static equilibrium rather than dynamic. Changes that are detectable and strong imply that the system is in flux and not balanced. The notion that all components of a system function independently does not align with the interconnectivity that characterizes a balanced system in dynamic equilibrium; rather, it suggests isolation which disrupts equilibrium.