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i) Malaria is always associated with damp and marshy land.
ii) Damp and marshy land.
iii) Malaria does not frequently occurs in dry desert countries because mosquito doesn't bleed there.
iv) The only way we can prevent the breeding of mosquito by standing in water. This can be done by draining all ponds and pools and by keeping them covered in the breeding season with a Film of kerosene oil which by depriving the lava of air and kill them.
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