Pls solve this i am really confused

Which factor contributed to the rise of african empires such as ghana and mali?

How does the author's discussion of schroeder's study contribute to the development of ideas about how children react to mistakes?

Which examples are relevant sources for students to use in research? check all that apply. a journal entry written by a professor who is considered an expert a report written by an independent government source a presentation by a company that includes paid information a document published by a renowned organization a scientific paper put out by a non-profit organization a blog whose author tries to sell a product or service