General functions of the integumentory system: Protection, sensation, temperature regulation, vitamin D production, Excretion: 3 Layers of skin: Epidermis- top, superficial, epithelial Dermis- deep layer of connective tissue Subcutaneous tissue- not part of skin, loose connective tissue that connects to underlying layers From deepest to most superficial, name and describe the five strata of epidermis
North American X-15. If the type of engine is not limited to jet-powered engines, then the North American X-15 is the fastest airplane. Powered by a rocket engine, the X-15 is said to have reached a speed of 4,520 miles (7,274 km) per hour. Like the X-43, it is launched mid-air from a B-52.
To supersede its U-2 spy plane, Lockheed developed the top-secret, stealthy SR-71 Blackbird, the world's fastest jet-propelled aircraft, one of which is displayed here. The Cold War ended with the peaceful collapse of the Soviet Union in 1991, and relations between the former adversaries began to warm.