Answer: The factors include the gene (genetic make up), hormones, nutrition, exercise and medical conditions.
Explanation: The genetic makeup of an individual determines 80% of a person's height. The genetic makeup is all the information contained in the DNA of an individual as inherited from the parents at conception.
Hormones such as growth hormones control the height of a person. A person with normal production and secretion of growth hormones is more likely to grow taller than a person with underproduction and secretion of growth hormones.
Nutrition: A child fed with balanced diet always will likely grow taller than a malnourished child. Good nutrition provides the body with right nutrients in the right proportion needed for bodily activities and for growth.
Exercise: regular exercise helps speed up growth. Children that exercise more regularly tend to be taller than children who do not exercise regularly.
Medical conditions: Children who have some medical conditions such as ailments and diseases tend to have stunted growth. Healthy children tend to have normally growth.