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              <p>We present the demography of the dynamics and gas mass fraction of 33 extremely metal-poor galaxies (EMPGs) with metallicities of 0.015-0.195 Z &lt;sub&gt;⊙&lt;/sub&gt; and low stellar masses of 10&lt;sup&gt;4&lt;/sup&gt;-10&lt;sup&gt;8&lt;/sup&gt; M &lt;sub&gt;⊙&lt;/sub&gt; in the local universe. We conduct deep optical integral field spectroscopy (IFS) for the low-mass EMPGs with the medium-high resolution (R = 7500) grism of the 8 m Subaru FOCAS IFU instrument by the EMPRESS 3D survey, and investigate the Hα emission of the EMPGs. Exploiting the resolution high enough for the low-mass galaxies, we derive gas dynamics with the Hα lines by the fitting of three-dimensional disk models. We obtain an average maximum rotation velocity (v &lt;sub&gt;rot&lt;/sub&gt;) of 15 ± 3 km s&lt;sup&gt;-1&lt;/sup&gt; and an average intrinsic velocity dispersion (σ &lt;sub&gt;0&lt;/sub&gt;) of 27 ± 10 km s&lt;sup&gt;-1&lt;/sup&gt; for 15 spatially resolved EMPGs out of 33 EMPGs, and find that all 15 EMPGs have v &lt;sub&gt;rot&lt;/sub&gt;/σ &lt;sub&gt;0&lt;/sub&gt; &amp;lt; 1 suggesting dispersion-dominated systems. There is a clear decreasing trend of v &lt;sub&gt;rot&lt;/sub&gt;/σ &lt;sub&gt;0&lt;/sub&gt; with the decreasing stellar mass and metallicity. We derive the gas mass fraction (f &lt;sub&gt;gas&lt;/sub&gt;) for all 33 EMPGs, and find no clear dependence on stellar mass and metallicity. These v &lt;sub&gt;rot&lt;/sub&gt;/σ &lt;sub&gt;0&lt;/sub&gt; and f &lt;sub&gt;gas&lt;/sub&gt; trends should be compared with young high-z galaxies observed by the forthcoming JWST IFS programs to understand the physical origins of the EMPGs in the local universe.</p>
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