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.
The Allied invasion of Normandy â American troops storm the beaches of Normandy, France, on June 6, 1944. D-Day was the largest seaborne invasion in history.More than 150,000 Allied troops -- about half of them Americans -- invaded Western Europe, overwhelming German forces in an operation that proved to be a turning point in World War II.EALITY: For many people, D-Day is defined by the bloodshed at Omaha -- the codename for one of the five beaches where Allied forces landed -- and the American airborne drops.