Explore changes that occur in homeostasis effecting the ‘normal’ balance in at least three tissue types that affect cognitive or motor abilities in infants, adolescents or the elderly. Explain how the frustrations that may arise in individuals (and parents of infants) going through the stage you chose can be mitigated by temporary or progressive changes in activities or by medical treatments.

Discuss the concept of twin studies in determining etiology of a disease with genetic components (DNA sequence changes or epigenetic changes).