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Which of these is a renewable source of energy?
In a food chain, plants are usually the ___.
The force that opposes motion between two surfaces is called ___.
Which system in our body helps us breathe?
Which of these materials lets light pass through it clearly?
Light travels in a straight line.
Which nutrient mainly gives our body energy?
Drinking enough water is important for our health.
Sound travels through the air as ___.
Sound can travel through water.