A dynamic SVG animation demonstrates the general update pattern for data joins, showing how enter, update, and exit selections handle changing fruit data. Five apples initially render as red circles, then sequentially: one apple is removed, one becomes a lemon, and another is filtered out. The code uses `d3.selectAll('circle').data(fruits)` with `.enter()`, `.merge()`, and `.exit()` methods, applying `transition().duration(1000)` for smooth radius changes. Fruit types map to colors and sizes via `scaleOrdinal`, with circles transitioning between states before removal.