In the early 1900s, scientists noted that chromosome movements during cell division in reproductive cells mirrored the patterns of inheritance described by Mendel. These results and others confirmed that Mendel's hereditary units (genes) were located on chromosomes. The sum total of chromosomes in an organism and the alleles they carry constitute its , whereas the organism's observable traits constitute its . See Section 1.1

dude really come on

explanation:

answer; i believe its echoic memory,it is believed to last three to four seconds; good luck

a "theory" a suggestion that is not 100 % accurate, or a figure. some people say its a theory because they of all the passed theory's about one subject. it depends sometimes theory might be accurate and sometimes they are.

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