(f) a sceptical fellow student suggested that the number of bubbles was dropping off as the lamp got further away because the pondweed was dying.

i) how could the student extend the investigation to show that this was not true?

ii) suggest another likely cause for the reduction in number of bubbles, in addition to those already mentioned in (d) and (f)

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answer: accepted answer: aquatic animals use the oxygen dissolved in water to carry out respiration. since the amount of dissolved oxygen in water is low as compared to the amount of oxygen in the air, therefore the rate of breathing in aquatic animals is much faster than it is in terrestrial animals.

explanation: