George was 19 years old when he was diagnosed with schizophrenia. he was a freshman at college majoring in pre-med at the time, but at 25, he now lives with his parents and gets social security disability income. this would be an example of the downward theory

The controlled use of fire by hominids: (a) limited the expansion of hominids into certain environments, such as dry grasslands. (b) decreased the amount of food energy available in the hominid diet. (c) contributed to geographical expansion and food production techniques in positive ways. (d) has been shown to contribute little to the digestive process of hominids.