Question: If sleep has a positive impact on health, then sleep has what impact on health?  Answer choices: - negative  - neutral  - exercise  - It expands  - ambiguous  - positive  - sweating  - movement
Answer: positive

Question: If water can be boiled to remove harmful substances before drinking, then what can be done to water to remove harmful substances before drinking?  Answer choices: - evaporation  - vaporization  - Dipping a magnet into it  - hydration  - Mixing in heavy metals  - Cooking  - Boiling it  - Adding purified water to it
Answer: Boiling it

Question: If insulated cups keep liquids full of warmth, then how do you keep a cup hot?  Answer choices: - less water  - electricity  - heat energy  - adding heat  - energy usage  - insulation  - squeeze  - energy
Answer:
insulation