Exercise guidelines released by the american heart association and the american college of sports medicine report that adults 65 and older should engage in at of moderate intensity exercise days a week.

answer; (d) none of the above;

chronological thinking is an indispensable tool to structure a historical narrative and to give meaning to a sequence of events. the final section presents the results of a survey to test the chronological thinking of lower secondary school students carried out by the educational research institute.