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

Lindane
DDT
Parathion
Carbary

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

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

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