Answer the following question given this paragraph: Sand is blown up a slope. Gravity pulls it down the other side. This is how dunes migrate. Q: Sand dunes migrate when sand is blown up a slope and this force pulls it down the other side? Choices: - earthquakes - air pressure - spin - gravity A:
gravity
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Answer the following question given this paragraph: Compared to free-floating bacteria, bacteria in biofilms often show increased resistance to antibiotics and detergents. Why do you think this might be the case?. Q: Compared to free-floating bacteria, bacteria in biofilms often show increased resistance to what? Choices: - acid and detergents - alcohol and detergents - acid and antibiotics - antibiotics and detergents A:
antibiotics and detergents
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Answer the following question given this paragraph: Coronary heart disease often does not have any symptoms. A symptom of coronary heart disease is chest pain. Occasional chest pain can happen during times of stress or physical activity. The pain of angina means the heart muscle fibers need more oxygen than they are getting. Most people with coronary heart disease often have no symptoms for many years until they have a heart attack. Q: The pain of angina means the heart muscle fibers need more what? Choices: - water - carbon - nitrogen - oxygen A:
oxygen
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Answer the following question given this paragraph: The Figure below shows the direction of the current that is generated by a moving magnet. If the magnet is moved back and forth repeatedly, the current keeps changing direction. In other words, alternating current (AC) is produced. Alternating current is electric current that keeps reversing direction. Q: What is the term for electric current that keeps reversing direction? Choices: - direct current - AC/DC - magnetic current - alternating current A:
alternating current
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