Either an environment or nature.
In the earlier part of the twentieth century, food spoilage was more of a concern. This is because there were fewer preservatives and less refrigeration. Antibiotics can also be a correct answer as well. Nowadays, food is filled with artificial flavors, colors and preservatives which lead to a longer shelf life.
<span>According to the diathesis-stress model of schizophrenia, people with an inherited predisposition for schizophrenia will experience a schizophrenic episode when they encounter various emotional or stressful events in their life. The answer to the given missing blank is the emotional events.</span>
