Obtain a preserved starfish and rinse off any preservative with water. Place the starfish in the dissecting pan with its dorsal or aboral (top) surface upward. Observe the starfish and determine its symmetry. Locate the central disc in the center of the starfish.Count and record the number of arms or rays the starfish has. Locate the small, round hard plate called the madreporite on top of the central disc. Water enters through this into the water vascular system. Label the central disc, arms, and madreporite on Figure 1.btain a preserved starfish and rinse off any preservative with water. Place the starfish in the dissecting pan with its dorsal or aboral (top) surface upward. Observe the starfish and determine its symmetry. Locate the central disc in the center of the starfish.
History. The third largest city in France, Lyon is situated in the Rhone-Alpes region between Paris and Marseille. A UNESCO World Heritage site, the city is home to roughly 490,000 inhabitants and was prized in ancient times as a major centre for the production and sale of silk.istory. The third largest city in France, Lyon is situated in the Rhone-Alpes region between Paris and Marseille. A UNESCO World Heritage site, the city is home to roughly 490,000 inhabitants and was prized in ancient times as a major centre for the production and sale of silk.
Paris Photos - France Map, Europe Maps France Map Information. Paris is the capital and largest city of France. It is situated on the river Seine, in northern France, at the heart of the Ile-de-France region. Its metropolitan area is one of largest population centers in the European Union and Europe, with more than 12 million inhabitants.