.1) Where in the USA are flash floods are most dangerous?
2) Why are they so dangerous?

the answer is c.) there is a warm front in region a and a stationary front in region b.

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)]