The variable is the group that was given caffine, because thats what the doctors manipulated. They possibly altered the natural memory of the participants by giving them caffine. A more specific variable could be how much caffine each participant is given and what time are they given it.
Answer: ( D ) Your cells would not work as well because even though they would have enough oxygen molecules from the air, they would not have enough glucose molecules from food.
Explanation: Your cells would have molecules from air, but would not get enough molecules from food.
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Answer:
SAT Reading Passages will extract from U.S. and World Literature, History/Social Studies, and Science.
