Some people may be more vulnerable to ptsd because they have which floods the body with stress hormones

PTSD stands for Post-traumatic stress disorder. Some people may be more vulnerable to PTSD because they have limbic system, which floods the body with stress hormones. The limbic system is a brain structure responsible for emotions, behaviors, motivation, long-term memory, and olfaction.

The changes to agriculture in the united states since 1900 is that increased mechanization has increased food production, thereby increasing the need for labor. there has been an increased need for higher speeds of food production due the fact that the population in the united states continues to rise.