13. Select the best statement that represents the color change for BTB 2 points BTB changed from green to yellow in the presence of carbon dioxide
BTB changed from blue to green in the presence of oxygen
+
BTB changed from yellow to green in the presence of carbon dioxide
all of the above
none of the above

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)]

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