What is random chromosome alignment resulting in variation

the farther away the object is from the central star (the sun) it's gravitainal pull on the object is weaker when it is farther

explanation:

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)]

the missing space is phylum