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.
Prior to Operation Overlord, the invasion of Normandy, the Allies ran a deception operation to convince the Germans that the invasion was planned for Calais. The name of this â¦ was Operation Quicksilver.he Germans did not believe that the Allies could provide enough supplies for the invasion across beaches. Since Calais is the narrowest point of the Channel, it was a logical choice. Operation Quicksilver had several aspects.