At day care 3-year-old sara has learned that she has to wait her turn to ride on the tricycle rather than push another child off the tricycle. using freud's terminology sara's ability to postpone gratification in a socially acceptable way is a reflection of her:

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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.