Which term best describes a set of interacting parts forming a complex whole?

• A. Producer
• B. System
• C. Ecosystem
• D. Community

Answer: (B)

A system is the best term because it describes a set of parts that interact with each other to form a complex whole. In science, a system emphasizes how components connect and influence one another, producing properties and behaviors that emerge from the whole, not just from individual parts. For example, a cell is a system of organelles working together, and an ecosystem is a system that includes living organisms plus the physical environment. The other options refer to specific roles or groups within a system (a producer, a community) or to a specific type of system (ecosystem) but don’t generalize the idea of an organized, interacting whole as directly as the term system does.