World War 2 occurred in the late 40's, so this is most likely why there is a dip in that age group.
Everything in Earth's<span> system can be placed into one of </span>four major<span> subsystems: land, water, living things, or air. These </span>four<span> subsystems are called "</span>spheres<span>." Specifically, they are the "lithosphere" (land), "hydrosphere" (water), "biosphere" (living things), and "atmosphere" (air).</span>
The Japanese suicide bombers were called kamikazes. so the answer is b
