Scaling relation between the velocity dispersion, radius, luminosity, and virial mass of CO clouds from different low-metallicity galaxies. The SMC clouds (9 pc resolution), indicated in green dots, are compared with the GMCs from 11 Dwarf Galaxies (DGs) at ~6–110 pc resolutions (Bolatto et al. 2008); and the clouds from LMC (11 pc resolution, Wong et al. 2011); WLM (~5 pc, Rubio et al. 2015); NGC 6822 (~2 pc, Schruba et al. 2017); the Magellanic-Bridge A, B, and C (~1 pc, Saldaño et al. 2018; Kalari et al. 2020; Valdivia-Mena et al. 2020); and LMC-30 Doradus (~0.45 pc, Indebetouw etal. 2013). In this figure, we include all SMC clouds with S/N > 3. The dotted lines indicate the relations of Solomon et al. (1987) for Milky Way GMCs.