3 Explain why the average height of students is increasing in many parts of the world.

The average height of people in different nations has  has increased approximately by 10 centimeters.It mostly comes down to nutrition and child-rearing styles. Some scientists believe that the increase in teenage and out-of-wedlock pregnancies in the developed world may be an unanticipated consequence of improved nutrition.

Tobacco smoking greatly increased over the last hundred or so years, but the old wives' dictum was always that "Smoking will stunt your growth!"

Hope this helped have a good day = )  .