Animal metabolism consists of the utilization of nutrients absorbed from the digestive tract and their catabolism as fuel for energy or their conversion into substances of the body. Metabolism is a continuous process because the molecules and even most cells of the body have brief lifetimes and are constantly replaced, while tissue as a whole maintains its characteristic structure. This constant rebuilding process without a net change in the amount of a cell constituent is …showed first 75 words of 1054 total…

…showed last 75 words of 1054 total…although the results tabulated may not be reliable enough to consider as legitimate results. Changes in the procedure, such as using the same crayfish for each trial, may have helped to eliminate that one possible source of error. Many more trials could have been done as well, to eliminate human error, or at least make it less likely. The results of the above experiment were not reliable enough to use in stating a definite conclusion.