How did star formation likely proceed in the protogalactic cloud that formed the Milky Way?a. The protogalactic cloud gradually formed stars, starting from the outer edges of the spiral arms and working inward.b. The stars that formed first eventually settled into a galactic disk, circling the center of the galaxy.c. The stars that formed first could orbit the center of the galaxy in any direction at any inclination.d. The protogalactic cloud gradually formed stars, starting from the center of the galaxy working outwards.

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