Which of these is a possible cause of schizophrenia? A. Living in a culturally diverse community
B. Having a good diet and exercise regime
C. Surviving a traumatic event or living in a harmful environment
D. Genetic and environmental conditions

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People who utilizes the progression principle will ensure their exercise program increases in frequency, intensity, time, and type. the changes need to happen gradually in order to ensure they make gains in their fitness program. a person who doesn't utilize the progression principle can still gain health benefits from exercising, but will not continue to improve in cardiovascular fitness.