Gill - Respiration

as the title says i would appreciate some help about respiration of holocephali and the evolution of operculum and the one gill opening thx

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... them all). 1. notochord or spinal column (ie vertebra) 2. pharyngeal (gill) slits 3. Postanal tail http://embryo.soad.umich.edu/carnStages/stage14/10310lftLat.jpg ... the original question: No, they're not gills. Gills are used for respiration. Their evolutionary lineage can ...

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1) On this question, it says: Organisms must obtain oxygen from their surroundings. Fish obtain oxygen by means of gills. Oxygen dissolved in the outside water moves through the gill membranes. Why do organisms need to take in oxygen? 3) In fish, the blood, after leaving the heart, ...

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... because they need it along with glucose to synthesise ATP for cellular respiration? Is there anything else to the question? Also, I have trouble ... by the equation: R= (A x C) / D R= Rate of movement A= area of the gill membrane C= the difference in concentration of oxygen on either side ...

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