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Course: Bio 102 Instructor: Marina Yoffe Assignment: Lab report (Introduction and discussion) Introduction The way in which different organisms acquire oxygen in exchange for carbon dioxide has truly evolved. The exchange of carbon dioxide for oxygen is essential for the survival of organisms that need to produce the energy molecule ATP through the process of cellular respiration. Respiration (breathing) is the way organisms exchange gases with their environment (White and Campo 2004). During cellular respiration organisms break down energy rich macromolecules such as starch to make ATP in a chemical reaction where oxygen and water is involved (Ege R. and A. Krogh 1914).The use of oxygen is very important; therefore the efficient…show more content…
Goldfish, like the shark, are aquatic ectoderms, but it is possible they regulate their metabolism in a different way. It is thought that aquatic ectoderms can only regulate their body temperature through adapting their eating habits or physical endurance, but respiration regulation is also important. Goldfish may be cold water fish, but this does not mean they can tolerate rapid changes in temperature. The sudden shift in temperature that comes at night, for example in an office building where a goldfish might be kept in a small office tank, could kill them, especially in winter (Black and E. C. Black 1947) The dependent variable for this experiment was the respiration rate of the goldfish, and the independent variable was the temperature of the water. The null hypothesis is that change in water temperature will affect the respiration rate of the goldfish; change in water temperature will promote a change in respiration. The alternative hypothesis suggests that a change in water temperature will not affect the normal respiratory patterns of the goldfish; the hypothesis suggests that this treatment, given to a goldfish normally kept in a room-temperature environment, will not have a significant impact on the rate of respiration. For the oxygen concentration, the null hypothesis is that the concentration of oxygen in water will increase with a decrease in temperature and decrease with

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