In summer the impact of greater cloud cover depends on the height of the clouds. cooling would prevail with an increase in low cloud cover thereby providing feedback. warming would likely accompany an increase in high cloud cover, thereby providing the opposite feedback.

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)]