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How bats uses echoes to find the way.

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Define atoms.

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Give some examples of non-biodegradable waste.

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How magnets can damagnetized.

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Define force.

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What is milky way galaxy.

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What are non-magnetic material? Give example

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Who was Sir Isaac Newton. How did he discover gravity

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What are magnetic material? Give examples

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What is air pollution.

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What are multicellular organism.

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What is static electricity.

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What are sound waves.

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What is sound? How is it travel.

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How noise and musical notes are produced.

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What is waning gibbous.

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Why do we need a digestive system.

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What are insulators. Give examples.

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How streamlining can help to reduce friction

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What is nitrogen? Give importance.

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