during the process of cellular respiration, energy is released from(1)Carbon dioxide (2) Oxygen atoms(3)Water molecules (4) chemical bonds

i believe it is "they are not used up by reactions" as the answer to your question, text me back if this is correct because i just learned this.

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)]