Which of the following statements correctly describes the process or processes by which fish ensure that gas exchange occurs at their gills?

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Most fish actively swallow water to move it across their gills.

  

The abundant gill filaments in gill arches help speed up the movement of water across gills.

  

Most fish carry out a pumping action with the mouth and operculum to move water across gills.

  

All fish carry out ram ventilation.

 

asked Dec 31, 2012 in Biology by anonymous
    

1 Answer

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Most fish carry out a pumping action with the mouth and operculum to move water across gills.

 

answered Dec 31, 2012 by anonymous

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