This interactive scatter plot visualizes the Iris flower dataset, displaying relationships between sepal and petal measurements. Users can dynamically switch which measurement appears on each axis using dropdown menus built with a custom D3 module. The visualization uses D3's `scaleLinear`, `axisLeft`, and `axisBottom` to render axes, while `transition()` animates point movement when axis selections change. Circles enter with a radius-growing animation and smoothly transition positions over one second, with the SVG rendered in React.