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Which of the following is a hypertonic solution?

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Which of the following is a hypertonic solution?

(a) Oceans

(b) Freshwater habitats

(c) 0.45% sodium chloride

(d) Red blood cells placed in fresh water

This question was addressed to me in an online quiz.

Question is from Tricky Questions and Answers topic in portion Regulation of Gene Expression and Miscellaneous of Biochemistry

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Right option is (a) Oceans

The best I can explain: The sea water or oceans are hypertonic to the extracellular fluid of many of the marine organisms. These marine organisms overcome the problem of hyper tonicity by expelling the salt water continuously.

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