The significance of people such as Betty White, Nelson Mandela, and Judi Dench are important with which aging theory? A. Role
B. Activity
C. Disengagement
D. Continuity

during longer space exploration trips, crewmembers may develop vision impairment risks and short-term cardiac atrophy or a decrease in the size, strength, weight, and activity of the heart during space flight because they can experience microgravity. in addition, the long-term medical condition is loss of bone mineral density and radiation exposure.