Five colored apples sit in a row inside an SVG, then transform through a sequence of update operations: one apple disappears, another changes to a lemon, and a third is removed. This demonstrates the D3 general update pattern, where data joins drive enter, update, and exit selections. The code uses `scaleOrdinal` for color and radius, `selection.merge()`, and `transition().duration(1000)` to animate changes smoothly.