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What observed feature of the Milky Way is better explained by the bottom-up hypothesis of galactic formation, as opposed to the monolithic collapse model?a.The different metallicities of the bulge and disk of the galaxyb.The supermassive black hole found at center of the galaxyc.The elongated shape of the central bulge of the galaxyd.The difference in age of globular clusterse.The very little gas or dust that halo contains
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