Contrast disruptive and stabilizing selections

Disruptive selection pressures are against average an select both extreme traits in a population. Stabilizing selection pressures select the average to be advantageous; thus their genetic diversity decreases. The gene frequencies in stabilizing selection are kept constant.

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)]