അടുത്തിടെ കാലിഫോർണിയ സർവ്വകലാശാലയിലെ ഗവേഷകർ കണ്ടെത്തിയതായി അവകാശപ്പെടുന്ന പുതിയ നിറം ?
Aലോറ
Bഓലോ
Cഗെമ്മ
Dലാമ
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Which of the following statements about primary pollutants are true?
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They are more toxic than secondary pollutants.
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