Chemistry
Which of the following appeared to be with a significant potential for accumulation through food chains ?

Carbary
DDT
Lindane
Parathion

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Chemistry
The open "Sigrees" or coal stoves often require fanning to sustain burning because of

Interrupted release of moisture from the material
Accumulation of smoke and dust over the sigrees
Lack of oxygen in the surroundings of sigrees
Tendency of carbon dioxide to form a layer along with dust smoke

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