What word best defines a collection of blocks that function together as a unit?

• A. Block
• B. Subset
• C. System
• D. Structure

Answer: (C)

Think of a system as a group of parts designed to work together toward a common function. In biology and biomedical sciences, components like organs, tissues, or modules interact—sending signals, exchanging materials, and depending on one another—to keep the whole set moving as a unit. That sense of coordinated action is what makes the word system the best fit for a collection of blocks that function together.

A block by itself is just an individual piece. A subset is a part of a larger whole but doesn’t imply coordinated functioning as a unit. A structure focuses on the arrangement or form of parts rather than their integrated, purposeful activity. So the term that captures both the parts and their joint, purposeful operation is system.