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The fish and other aquatc life do not get enough oxygen and thus die. Why?

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What two characters will help you to identify a bird?

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Why do scientists classify organisms?

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When water canal passes through agriculture land, how is it polluted?

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What are dcomposers?

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What is microscope?

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What can happen, if we keep milk in the kitchen and do not boil it?

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What is pathogens?

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What is yeast? Write down its use?

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Write two ways to avoid infection.

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How do the bacteria spoil our teeth in our mouth?

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What is infection?

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Name the dolphin which only found in Pakistan?

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How land is polluted?

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What are insects?

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Define biodegradable materials

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How air pollution effects humans?

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Write down the names of diseases caused by virus?

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Write some causes which pollute the water.

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Define classification?

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