What’s the answer for the extra credit ? answer this

The football player may have eaten a salad before the game. The salad was broken down into ATP, which is energy. Furthermore, the salad would not even exist without the energy of the sun, which produced the football player's food.

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)]