What is associated with: a docked horses tail or a short haircut for women popular in the 1920s?

Based on the clue 'a division of a play or the plays setting', what is the answer? Based on the clue 'a division of geologic time', what is the answer? Based on the clue 'a dizzy sensation of tilting within stable surroun...', what is the answer? Based on the clue 'a dj on wkrp hes now head of the class', what is the answer? Based on the clue 'a doctor could tell you that qid which is the abbr...', what is the answer? What is referred to by 'a doctor gp'? Based on the clue 'a doctor in her first year out of med school when ...', what is the answer? Based on the clue 'a doctor may use a hematocrit test to measure the ...', what is the answer?