State true or false: Scuba divers carry oxygen cylinders with them.

A) True

B) False

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The correct answer is B) False.

Scuba divers do carry cylinders, but these are not filled with pure oxygen. Rather, the cylinders contain compressed air, which is approximately 21% oxygen and 78% nitrogen, similar to the air we breathe normally. Pure oxygen can be toxic at higher pressures experienced underwater, which is why it is generally mixed with other gases when used for breathing in scuba diving setups. Thus, stating that scuba divers carry "oxygen cylinders" might be misleading if one interprets it as carrying pure oxygen.

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