Please help me ASAP! Will Mark brain list

Experiment to investigate effect of medication on levels of stress in males and females. dependant variable?

Adolescents can display egocentrism when they become about changes in their lives.

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.