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How decomposers are useful?

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Define law of constant composition

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Where frozen water is found?

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Define environment?

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If water runs downhill to the seas, what are some way that make fresh water polluted?

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What is meant by purification of water?

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Write the affects of air pollution?

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Write two ways to conserve water.

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Name the producers in sea food chain?

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How the chemical formula of a molecule of an element is denoted?

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What does give the positive charge to the nucleus of an atom?

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Why electric charge on an atom is zero or neutral?

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What was the first atomic model?

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