Final answer:
Synergy in biological systems refers to the collaborative interaction between subsystems or organ systems, resulting in greater efficacy than if they worked independently. It is vital for maintaining homeostasis in organisms.
Step-by-step explanation:
The concept of synergy refers to the interaction of two or more subsystems within an organization or system that results in a combined effect greater than the sum of their separate effects. This is option c), which states that it is 'Two or more subsystems working together to be more successful than working alone.' Synergy is crucial in biological contexts, such as within the human body where different organ systems work in concert to maintain homeostasis. This collaborative functioning can be seen in how feedback mechanisms regulate physiological processes. For instance, negative feedback systems help to maintain a stable internal environment by reversing any physiological changes that move away from the norm, ensuring that organismal levels are preserved. Conversely, when synergy is disrupted, as in the case of diseases like type 1 diabetes, the systemic collaboration breaks down, causing significant health issues.