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Which of the following would be considered basic science questions?

A. How can cars be made safer?
B. What is the best way to improve a gas engine?
C. Why do many birds have colorful feathers?
D. What are the stages in the life cycle of a star?

User Egonzal
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all a car will need a better seat belt I guess so it is tighter or an air gag so then passages are safer to
User JNevill
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