1 Understanding a Photosynthesis Diagram Photosynthesis is a process by which plants convert the radiant energy of sunlight into chemical energy that can be used by themselves to power their lives. 2  A diagram of photâ¦.
U-Boat Crew. The crew numbers aboard a U-boat varied greatly between different U-boat types and the mission it was undertaking. A Type II U-boat comprised of 25 officers and seamen, while a Type VII housed approximately 45. A Type IX had about 50 and Type XXI had a 57 man crew. Sometimes U-boats carried specialist crews on special missions, such as scientists, spies or commandos.
They also invented torpedoes which were propelled by small electric motors, thereby introducing one of the most dangerous weapons in the world. Submarines are also called U-boats, which is short for Unterseeboot, the German word for undersea boat. The first nuclear-powered submarine, the USS Nautilus (SN-571), was launched in 1955.