Animated fruit bowl demonstrations show how data joins and transitions work in D3.js, with apples and lemons appearing, disappearing, and changing type over time. Using `selectAll` and the `.enter()`, `.merge()`, and `.exit()` selection APIs, circles animate their radius and position through `.transition()`. A separate face graphic uses `arc()` paths and tweened eyebrow movements, while click and hover interactions trigger selection states that update stroke styling.