This interactive scatter plot visualizes the classic Iris dataset, showing sepal length against sepal width for 150 flowers across three species. The visualization, rendered with SVG and built using React, D3.js, and the `select`/`join` API, allows users to click any circle to highlight it. It uses `d3.axisBottom` and `d3.axisLeft` for axes, `d3.scaleLinear` for scales, and `ResizeObserver` for responsive sizing. The code loads data from a local CSV file.