Two fish were kept in a tank as shown below for 3 days.
(a) Where did the fish get their supply of oxygen from?
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(b) There are some feather-like structures found under the gill covers of the fish. What are these structures?
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(c) Suggest two ways in which the amount of oxygen in the tank could be increased.
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(a) They get it from the dissolved oxygen in the water.
(b) They are the gills.
(c) By putting in water plants. By putting in air pump to pump air into the water.
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