Questions 1. Does the hydra illustrate the polyp or the medusa stage? 2. How many germ layers does the hydra contain? 3. What type of symmetry is seen in the hydra? 4. Can you find the hydra tentacles? How many tentacles does your hydra specimen contain? 5. Name the stinging cells present on the tentacles that are unique to cnidarians. 6.Explain the movement of the hydra if live specimens are available. 7. If there are live hydra specimens do not add the vinegar as indicated on the lab website. Vinegar causes them to expel the cnidocytes. 8. View the preserved cnidarian specimens will be on display. They may differ from the ones directly mentioned in the lab website but there should be some medusa cnidarians as well as corals and sea anemones. Please make observations on the available specimens.

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Classification of Marine Organisms

Classification is a way of categorizing organisms that enables an easy process of identification of such organisms. All living things are classified by grouping them under specific categories. The grouping is done based on the close relativeness of the organisms. The classification tool requires knowledge of characteristics, differences, and similarities between different organisms.