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 was the code name for the Battle of Normandy, the Allied operation that launched the successful invasion of German-occupied western Europe during World War II.he Normandy landings were the largest seaborne invasion in history, with nearly 5,000 landing and assault craft, 289 escort vessels, and 277 minesweepers. They hastened the end of the war in Europe, drawing large forces away from the Eastern Front that might otherwise have slowed the Soviet advance.