21. b) cross-sectional studies d) counts c) proportionate mortality comparisons

Ihave no idea what the answer is

Loss of funding i think

Ithink it’s a i’m not 100 percent sure though

Literature had become much more popular and advanced  , and narratives about human behavior, instead of philosophy and religion were being focused on much more . different books about medicinal things were also written , which focused  on surgery and groundbreaking advances in the  procedures of lifesaving practices.