Genetic changes have been found in groups experiencing low socioeconomic status and posttraumatic stress disorder. these finding illustrate:

The correct answer environment-gene interactions

Environment-gene interactions refers to the phenomenon in which environmental factors such as: drugs, food, pollution, toxins, etc., can affect a person's genes or gene expression. Individuals of low socioeconomic status are likely to experience environment-gene interactions because they are not able to access hygienic and healthy foods, they are more likely to abuse drugs and be exposed to toxins. Similarly, due to former unhealthy environments, individuals with PTSD can experience environment-gene interactions. 

Habit is no concious