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ANSWERS: 2
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It starts pretty quickly, depending on a few things: If i twas Exposed to the elements A dead body that is exposed to the open elements, such as water and air, will decompose more quickly and attract much more insect activity than a body that is buried or confined in special protective gear or artifacts. This is due, in part, to the limited number of insects that can penetrate a coffin and the lower temperatures under soil. Media for bacterial growth Similarly, a submerged body is shielded from air-living organisms; however, it is exposed to a new set of waterborne breakdown agents such as the bountiful water life and marinal bacteria. Ambient temperature Ultimately, the rate of bacterial decomposition acting on the tissue will depend upon the temperature of the surroundings. Colder temperatures decrease the rate of decomposition while warmer temperatures increase it. This site explains it is detail http://www.deathonline.net/decomposition/index.htm -
6 hours, as a thump rule. But any chemical/drug/poison that might have been ingested before death could be detected till the half-life of that substance is reached, which could be several months or years.
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