Sleep researcher Dr. Nathan Boyle conducted a study on the effects of irregular sleep schedules among college students. Boyle reported, “Students who went to bed and woke up at roughly the same time each day earned grade point averages that were, on average, 0.5 points higher than those of students with highly variable sleep schedules. Importantly, this difference held even when we controlled for total hours of sleep, meaning that consistency mattered independently of how much sleep students got.”

Which quotation from the text best supports the claim that sleep consistency affects academic performance regardless of total sleep time?

Ecologist Dr. Maren Lindqvist has studied the reintroduction of wolves to Yellowstone National Park. In a research summary, Lindqvist explained, “Before wolves returned in 1995, elk herds grazed freely along riverbanks, stripping young willow and aspen trees before they could mature. With wolves present, elk began avoiding open riverbanks, allowing trees to regrow. As the trees returned, their root systems stabilized the soil, and the rivers actually began to change course, carving narrower, deeper channels instead of wide, shallow ones.”

Which quotation from the text best supports the claim that the presence of wolves indirectly affected the physical landscape of Yellowstone?

Archaeologist Dr. Fatima Nassar has been studying ancient trade routes in the Mediterranean. Nassar recently published findings showing that pottery fragments recovered from a 2,500-year-old shipwreck off the coast of Turkey contained trace minerals matching clay deposits found only in southern Spain. She wrote, “This chemical signature is as distinctive as a fingerprint. The match confirms that these vessels were manufactured on the Iberian Peninsula and then transported more than 2,000 miles by sea. It is some of the clearest physical proof we have that long-distance maritime trade networks existed in the western Mediterranean far earlier than many scholars had assumed.”

Which quotation from the text best supports the claim that Nassar’s discovery challenges previous assumptions about Mediterranean trade?

Psychologist Dr. Leo Brandt has researched the effects of background music on workplace productivity. In his summary of findings, Brandt stated, “Participants who listened to instrumental music while performing repetitive data entry tasks completed 12 percent more entries per hour than those who worked in silence. However, when the tasks required creative problem-solving, the music group performed slightly worse, suggesting that the benefits of background music depend heavily on the type of work being done.”

Which quotation from the text best supports the claim that background music does not universally improve work performance?

Botanist Dr. Hana Osei has investigated why certain houseplants thrive in low-light conditions. In a published paper, Osei wrote, “Plants like the pothos and snake plant have evolved larger chloroplasts with a higher density of light-capturing pigments, allowing them to photosynthesize efficiently even under dim artificial lighting. Interestingly, when these same species are placed in direct sunlight, their growth rate does not increase proportionally; in fact, several subjects showed signs of leaf scorching within just two weeks of full sun exposure.”

Which quotation from the text best supports the claim that low-light houseplants are not necessarily better off with more sunlight?

Urban planner Dr. Rafael Mendez has studied the impact of community gardens on city neighborhoods. In a recent article, Mendez wrote, “Blocks with active community gardens saw a 15 percent drop in reported property crimes over a three-year period compared to similar blocks without gardens. Residents on these blocks also reported knowing more of their neighbors by name. While we cannot prove the gardens directly caused the decline in crime, the correlation with increased social connection suggests that the gardens may reduce crime by strengthening community bonds rather than through any physical security measure.”

Which quotation from the text best supports the claim that community gardens may reduce crime through social effects rather than physical ones?