This example demonstrates the general update pattern with mixed enter and update selections using D3.js v5 and SVG animations. It shows a row of apples that transition into lemons and disappear over time, with new circles smoothly merging into the existing selection. The code uses `selection.enter().append()`, `selection.merge()`, `selection.exit()`, and `transition.attr()` to animate radius and color changes. Data is generated with `d3.range` and mapped to fruit types, while `d3.scaleOrdinal` maps types to colors and sizes.