A. They vary in how tightly their arms are wound
B. Some are more elongated in shape than others
C. Some have a band of stars and materials through their middle, but others don’t
D. They vary in the brightness of stars located on their arms
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The two correct answers regarding the variation in the appearance of spiral galaxies are:
A. They vary in how tightly their arms are wound
B. Some are more elongated in shape than others
These characteristics illustrate the diversity in morphology among spiral galaxies.
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