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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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