Dittmar analyzed approximately seventy seawater samples collected around the world during the Challenger Expedition. He concluded that ________.
A. the major ions were always present in the same ratios and dissolved gases are always present in the same ratios
B. salt content changes due to processes that add or subtract salt
C. the major ions were always present in the same ratios
D. seawater had the same salinity worldwide
E. dissolved gases are always present in the same ratios
Answer: C
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Fill in the blank with correct word.
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