There are over 2,900 species of snakes ranging as far northward as the Arctic Circle in Scandinavia and southward through Australia. Snakes can be found on every continent except Antarctica, in the sea, and as high as 16,000 feet (4,900 m) in the Himalayan Mountains of Asia.
The negative symptoms of schizophrenia are passive in nature. They affect the personâs thinking, emotion and behavior and can be the most devastating of all the symptoms. Three of the most common are flat affect, alogia, and avolition.
Men and women show different patterns of susceptibility for developing schizophrenic symptoms. Males reach a single peak of vulnerability for developing schizophrenia between the ages of 18 and 25 years. In contrast, female vulnerability peaks twice; first between 25 and 30 years, and then again around 40 years of age.