Which of the following statements about influences on personal health is true? a) environmental factors determine whether or not all genetic traits lead to health issues. b) an individual’s health is affected by their environment and personal genetic makeup. c) genetic factors are more important than environmental factors in determining an individual’s personal health risks. d) down syndrome and sickle cell disease are caused by the same type of genetic abnormality. e) environmental factors are the only influences that may determine whether one is likely to suffer from certain diseases or not.