[answer with explanation please]
The layers of rock may be relatively dated, from youngest to oldest

A) G, F, E, D, C, A, B
B) G, F, D, C, B, E, A
C) G, F, D, E, C, B, A
D) G, F, E, D, C, B, A

halogen, any of the six nonmetallic elements that constitute group 17 (group viia) of the periodic table. the halogen elements are fluorine (f), chlorine (cl), bromine (br), iodine (i), astatine (at), and tennessine (ts).

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)]