Studies suggest that schizophrenia may be associated with an increased sensitivity of receptors within the _

Me with this psychology homework, i’m struggling with it.

What greek scientist created a screw to move water for irrigation?

Which factor contributed to the rise of african empires such as ghana and mali ? a. their creation and involvement in trade networks b. they focused only on agricultural production. c. they didn’t engage in warfare with other nations d. their geographic location protected them from attacks.