How does the presence of an oncogene lead to the formation of a tumor

it becomes a horrible gene that can become permanently turned on or activated when it is not supposed to be.

Explanation:

this is because the cells get out of control and can lead to cancer

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)]