Which evolutionary force is initially responsible for the genetic change in the human gene pool for sickle cell anemia?

the pic attached shows the stages of mitosis. hope it !

answer; the tunica intima also called tunica interna, consists of elastic fibers,connective tissue and smooth muscle cells;

primary succession occurs in essentially lifeless areas regions in which the soil is incapable of sustaining life as a result of such factors as lava flows, newly formed sand dunes, or rocks left from a retreating glacier. secondary succession occurs

i'm guessing this is from edg enuity so the answers would be, from top to bottom,

theodor schwann

matthias schleiden

robert hooke

rudolph virchow

anton van leeuwenhoek