Five apples animate into view as red circles, then sequentially demonstrate D3 data joins: one apple disappears, another turns into a yellow lemon, and a third is removed. The example uses `d3.select` and `scaleOrdinal` for color and radius, with `selection.enter`, `merge`, and `exit` to manage updates. Transitions via `transition.duration` and `attr` animate the changes over one-second intervals, rendering static SVG circles that reshape and recolor in place.