Compare two of the organisms that we have dissected Discuss at least 2 similarities and 3 differences

  We dissected many organisms so far, and these organisms have various similarities and differences.  For example, we dissected both crayfish and fish. There are many similarities between crayfish and fish.  Both crayfish and fish have gills which is the respiratory organ that animals use to breath under water.  In addition, another similarities between crayfish and fish is that both of these animals have the whole digestive system, such as esophagus, stomach, big and small intestines and the anus.  Furthermore, both of crayfish and fish are internal fertilization and external reproduction.  On the other hand, there are still some differences between these two animals.  For instance, the crayfish has hard external shell which is made by carapace, but the fish has the soft body, and it is made by the scales.  The crayfish has swimmerets to help swimming, but the fish has fins in order to swim.  The mouth parts of crayfish and fish are also different since the mouth part of crayfish is mandible, yet the fish has jaws.