This puzzle asks you to find the single category linking five clues: Class, Order, Family, Genus, and Species. The answer is Biological taxonomy (ways to classify living things). The clues look unrelated on the surface but share one precise category. Read all five before guessing — the link should feel natural on every row. With only "Class", many categories could fit. Hold your first guess and watch what clue 2 eliminates. "Class" and "Order" must share one repeatable link — not a coincidence between two words. By clue 3 ("Family"), "Biological taxonomy (ways to classify living things)" should explain all three without bending meanings. "Genus" strengthens "Biological taxonomy (ways to classify living things)" rather than opening a new theory. The final clue ("Species") confirms "Biological taxonomy (ways to classify living things)" — if it still fits naturally, the category is locked. Use the Solution tab above for an interactive clue-by-clue walkthrough, or the Solved board tab for the complete answer at a glance.