The two subspecialties of astronomy are A. environmental earth science and environmental chemistry. B. paleontology and geochemistry. C. astrophysics and planetary science. D. climatology and atmospheric chemistry.

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The two subspecialties of astronomy are A. environmental earth science and environmental chemistry. B. paleontology and geochemistry. C. astrophysics and planetary science. D. climatology and atmospheric chemistry.

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The two subspecies of astronomy are astrophysics and planetary science.