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Why does a deep sea diver carry oxygen c...

Why does a deep sea diver carry oxygen cylinder on his/her back?

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(1)Oxygen is present in dissolved state in water .
(2) Human beings do not have giils like the fish which can extract dissolved oxygen from water and utilise it for breathing.
(3)Morever as we go deep down in water , the oxygen levels starts decreasing .
(4)So a deep sea diver carries an oxygen gas cylinder for breathing when he/she goes deep under the sea water
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VGS PUBLICATION-BRILLIANT-RESPIRATION - THE ENERGY PRODUCING SYSTEM -CREATIVE QUESTIONS FOR NEW MODEL PAPER ( 4 MARK QUESTIONS)
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