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In a primordial, pregalactic gas cloud, what is believed to have been the most important condition that caused the cloud to become a spiral galaxy?

In a primordial, pregalactic gas cloud, what is believed to have been the most important condition that caused the cloud to become a spiral galaxy?


a. The cloud started off with a lot of dust and heavy elements.

b. The initial rate of star formation was high.

c. The cloud started off flattened and disk-shaped before it collapsed.

d. The initial rate of star formation was low.

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