An elliptical galaxy could   a. evolve into an irregular galaxy when it has used up all of its gas and dust.   b. be formed from the collision and merger of spiral galaxies.   c. evolve from a single spiral galaxy when the spiral has used up all of its gas and dust.   d. become a starburst galaxy if it were to move through the hot intergalactic medium of a cluster.   e. evolve from an S0 galaxy if the S0 galaxy were to increase its rotation rate.

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