Use the drop-down menu to complete the sentence the western roman empire finally collapsed due to a. attacks by the persians b. civil wars between army commanders c. attacks by germanic tribes d. conquest by the eastern empire

2. every fitness program should include a. a longer warm-up period than cool-down period. b. a warm-up, a primary conditioning period, and a cool-down. c. at least 60 minutes of cardio activity. d. at least 15 minutes of vigorous activity.