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.
The first submarine was developed by Cornelis Drebbel, a Dutchman, in 1620. The first submarine that went into action was the Turtle, developed by David Bushnell in 1776. It went in action, but never sank a ship. The first submarine to do that was the Hunley in 1864. (With the loss of the submarine, and its entire crew). The first modern submarine that went into service was the Holland, invented by John Holland in 1903.