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Although there is still disagreement among the scientific community, some research suggests that the reason people yawn is because doing so increases blood flow and cools the brain.
A. among the scientific community, some research suggests that the reason people yawn is because doing so increases blood flow and cools
B. among the scientific community, some research suggests that the reason people yawn is that yawning increases blood flow, cooling
C. between the scientific community, some research suggests that the reason people yawn is that yawning increases blood flow and cools
D. within the scientific community, some research suggests that people yawn because by doing so, blood flow increases, thereby cooling
E. in the scientific community, some research suggests that the reason people yawn is because the act of yawning increases blood flow, thereby cooling
OA B
Source: Manhattan Prep
A. among the scientific community, some research suggests that the reason people yawn is because doing so increases blood flow and cools
B. among the scientific community, some research suggests that the reason people yawn is that yawning increases blood flow, cooling
C. between the scientific community, some research suggests that the reason people yawn is that yawning increases blood flow and cools
D. within the scientific community, some research suggests that people yawn because by doing so, blood flow increases, thereby cooling
E. in the scientific community, some research suggests that the reason people yawn is because the act of yawning increases blood flow, thereby cooling
OA B
Source: Manhattan Prep
