Can you me with question 56 ? show work.

Ifigured out the question and i dont know what to put here

In what organelle does photosynthesis take place?

An energy drink company claims that its product increases students' memory levels. to support its claims, the company issues advertisements claiming that 8 out of 10 people (chosen randomly from across the country) who tried their product reported improved memory. the missing component in this study is a .