Genie could not develop language capacity. Ignored by parents.
Dark colour in tropics white in temperate areas.
Nigerian and eskimo girl have menarche at 14.3 years but European and Assamese girl have 13.2
Hormones
Thyroid. Control energy and cognition
Testosterone secondary and sexual phenomenon behaviour. Oestrogen in women breast development.
Growth hormones for bones muscles body increase. Lionel Messi
Nutrition.
Deficiency of proteins vitamins fat carbohydrates water. World war 2 study showed that height of children was slow but they also catch up quick. Anderson 2004.
Behaviour social cultural factors.
Economic deprivation cast nfhs study more stunting and more prone to disease. Smoking increases cancer. Alcohol destroyed liver.
During pregnancy e effect of stress nutrition and behaviour affects the child.
Poverty effects 10% of genans inherited. McDade 2019.
children born during the war and living in a war region have 0.42 standard deviations lower height-for-age Z-scores. Akresh 2012. Ethiopia war.