_ is a method used to determine the absolute age of a sample by measuring the relative amounts of parent isotope and daughter isotope

your answer is "the 1950's"

i believe the answer would be b. hope it : )

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)]