1. What factors will cause the size of a population to decrease?

i.Mortality:which is the number of individual death in a population over a period of time

ii.Imigration:which is migration of individual from one place

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)]