1.mitochondria are sometimes referred to as the of the cell. 2.human beings have level organization, in which groups of organs work together to do a certain job.

blah

explanation: bc blah

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)]