The sponges are an ancient group with a fossil record back as far as the Precambrian. There are about 10,000 known species of marine sponges, and about 150 freshwater sponges. They are relatively abundant in all marine waters at all depths. They vary in size from a few millimetres to over two metres across.
Operation Overlord was the code-name given to the Allied invasion of France scheduled for June 1944.The overall commander of Operation Overlord was General Dwight Eisenhower.ecurity for the plan had to be total. The fact that the Germans were taken by surprise at Normandy indicates that the Allies were successful in this. The first issue that the Allies had to decide on was where to land in France. The Pays de Calais was an obvious choice as it was the nearest part of France to Britain.
Operation Overlord. By early 1944, the Allies, under the leadership of U.S. general Dwight D. Eisenhower, had been planning an invasion of France for more than a year. The Germans, anticipating such an invasion since 1942, had begun building the Atlantic Wall, a series of heavily armed fortifications all along the French coast.