Definition
A precursor is something that comes before another thing and influences its development. It's a forerunner, setting the stage for what's to come. Unlike a simple cause, a precursor provides necessary conditions. Think of it like ingredients in a recipe π²; they're all precursors to the final dish. It emphasizes a developmental relationship, where the later thing builds upon the earlier one. A precursor isnβt just *before*; it's *instrumental*.