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Which natural resource necessary in many space flight technologies is widely available on Earth because the Sun-Earth system is so young? A. hydrogen B. wind energy C. helium D. aluminum
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Which natural resource necessary in many space flight technologies is widely available on Earth because the Sun-Earth system is so young? A. hydrogen B. wind energy C. helium D. aluminum

User Scratcha
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6 votes
b is the answer to the question
User Rippo
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