Q7 of 38 Page 45

Why does a deep-sea diver carry oxygen cylinder on her back? (AS1)

1. Human beings are adapted to a terrestrial habitat. They respire through lungs (pulmonary respiration).

2. Humans use oxygen in a gaseous state. Whereas organisms living in water (aquatic organisms) use oxygen dissolved in water.


3. Therefore, deep sea water diver carries gaseous oxygen cylinder for breathing as under water cannot use dissolved oxygen.


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