What type of mutation is caused when a codon that corresponds to one of the twenty amino acids specified by the genetic code is changed to a chain-terminating codon?

A nonsense mutation
B silent mutation
C chromosomal mutation
D missense mutation

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

answer : haversian

[explanation: -(compact bone is organized as parallel columns, known as haversian systems, which run lengthwise down the axis of long bones. these columns are composed of lamellae, concentric rings of bone, surrounding a central channel, or haversian canal, that contains the nerves, blood vessels, and lymphatic system of the bone)]