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                                    Fill in the blanks: (1) ........ egg is the biggest cell in nature. (2)........... are the respiratory organs of fish. (3) Frogs have ...........feet which help them swim in water. | 
                            
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Answer»  (1) Ostrich egg is the biggest cell in nature. (2) Gills are the respiratory organs of fish. (3) Frogs have Webbed feet which help them swim in water.  | 
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