This interactive scatterplot visualizes the classic Iris dataset, allowing users to compare any two measured features (sepal/petal length and width) via dropdown menus. D3 v7 axes and scales update with animated transitions when a new axis is chosen. Circles are color-coded by iris species, with a legend showing the three classes. The data is loaded from a CSV using `d3.csv`, and the visualization leverages `scaleLinear`, `axisBottom`, `axisLeft`, and `transition` for smooth updates.