Five apples appear in a row as red circles, then one disappears when the data array shrinks, and a later apple turns yellow to become a lemon. The example demonstrates the D3 general update pattern using `selection.enter()`, `selection.exit()`, and the merge of new and existing elements. It uses `d3.scaleOrdinal` for color and radius mappings based on fruit type, with `setTimeout` calls to trigger the data changes. Rendering targets an SVG canvas via D3 v5.