Evolution of Leo A over the last 10 Gyr in the mass-metallicity plane. Left panel: White square represents Leo A 10 Gyr ago, whereas the white dot represents Leo A in the present day. The closed-box-model and accretion-model median tracks that approach our estimates are shown as the dotted black and dashed red lines, respectively. The leaky-box and the gas-regulator (bathtub) model median tracks that reproduce our estimates are shown with the solid magenta and the dashed cyan curves, respectively. The closed-box, accretion, leaky-box, and gas-regulator tracks generated by the Monte Carlo simulations are shown with the semi-transparent black, red, magenta, and cyan curves, respectively. Right panel: Same as left panel, but using the T_e− corrected gas-phase metallicity as the present-day chemical status of Leo A, shown with the white triangle.