As a child, alex was short for his age. but during his teenage years, his height increased and he surpassed most of his friends. what must have occurred to create this growth spurt?

This teenager had a growth spurt due to several factors (external and internal factors).

The growth spurt is influenced by the genes that he inherited from his parents. Their geographical origins are also an indicator.

Living conditions also affect growth.

The decline in infectious diseases and a diet richer in protein explain why the pace of growth has changed significantly for more than a century.

the answer is b)3/8x+1

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)]