How are natural areas different from rural areas

In a natural area there's no human life, because of the protection of the fauna and the flora. In a rural area there's a little human life, in farms, camps etc.

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)]