How effective is the moderna vaccine after one dose

the answer to this predicament is false, by friend, i had this on a quiz, and i got it wrong, so i learned it, cos i was gonna have it on a test, and i got it right

answer: 21

step-by-step explanation:

divide 630 by 30. 30 goes into 630 21 times

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