Part of a cell where catabolism primarily occurs: cell membrane nucleus mitochondria genes endoplasmic reticulum

The answer is mitochondria. Catabolisms involves the prices of breaking down bigger molecules into smaller molecules. It is the opposite of anabolism which is the building of bigger molecules from small ones. In the mitochondria, molecules (pyruvate) are broken down (in a series of redox reactions) in the Krebs cycle to produce ATP.

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)]