Answer: Studies have found that physical activity can reduce feelings of stress and anxiety.

Only this evidence directly supports the point about mood. The others may be true but are off topic.

Answer: A report from a university marine science department

A university research department has expertise and no obvious reason to exaggerate. A company selling a product may be biased.

Answer: Any two: it has no source; everyone knows is a vague claim, not evidence; the number may be exaggerated or made up; it does not say who was measured or how.

Answer: Model: According to one sleep researcher, sleep is "when the brain sorts and stores what we learned" each day, which suggests that a good night's rest helps students remember their lessons.

Answer: Any three: According to...; Research shows that...; As one expert explains,...; For example,...; A recent survey found that...; Data from... suggests that...

Answer: Model: This shows that reading is a regular habit for most students at that school, although a larger survey across many schools would be needed to say the same about all students.

Answer: True

Evidence does not speak for itself. The explanation tells the reader why it matters.

Model answer: Trees make cities healthier and more comfortable places to live. One major benefit is shade: according to many city planners, streets lined with trees are noticeably cooler on hot days than streets without them. This matters because extreme heat can be dangerous, especially for older people and young children. Trees also clean the air. For example, their leaves trap dust and other tiny particles, and as they grow they take in carbon dioxide. This means that planting trees can help reduce pollution in busy areas. Overall, the evidence suggests that trees are not just decoration but an important part of a healthy city.