**Petal length is the most important numeric metric in this dataset.** This is a judgment based on how well it separates the three species, which is the dataset's main decision use. I did not compute a formal feature-importance score. **Why petal length** - The species averages are far apart: setosa 1.46, versicolor 4.26 and virginica 5.55 (step 0). - Setosa's maximum (1.9) is well below versicolor's minimum (3.0), so petal length alone isolates setosa completely (step 3). - Versicolor and virginica overlap only a little. Versicolor runs up to 5.1 and virginica starts at 4.5, and their medians are 4.35 and 5.55 (step 3). - Sepal width separates the species poorly by comparison. The ranges are 2.3–4.4 for setosa, 2.0–3.4 for versicolor and 2.2–3.8 for virginica, so they overlap heavily (step 3). **Highest and lowest records by petal length** (step 2) - **Highest:** a virginica specimen with petal length 6.9, petal width 2.3, sepal length 7.7 and sepal width 2.6. - **Lowest:** a setosa specimen with petal length 1.0, petal width 0.2, sepal length 4.6 and sepal width 3.6. The extremes fall in the two most distant species, which is why the metric is useful for classification. The full range is 1.0 to 6.9, nearly a sevenfold spread. Within species, setosa spans only 1.0–1.9, so petal length is very tight there. I only compared petal width by species averages (0.25, 1.33 and 2.03), which suggest it also separates the species well. Petal length and petal width are likely close runners-up, and I did not test them against each other.