Define air pollution and green house effect
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Someone is looked for by them to help them.
Here, 'look for' is a group verb.
Someone is looked for by them to help them.
Here, 'look for' is a group verb.
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ਹਵਾ ਦਾ ਪ੍ਰਦੂਸ਼ਣ ਵਾਤਾਵਰਨ ਵਿਚ ਨੁਕਸਾਨਦੇਹ ਪਦਾਰਥਾਂ ਦੇ ਗੰਦਗੀ ਦੇ ਕਾਰਨ ਹੁੰਦਾ ਹੈ...
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