The states that allele frequencies in a population remain constant unless forces cause the frequencies to change. hardy-weinberg principle endosymbiotic theory theory of evolution descent with modification theory

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)]