Answers

2014-10-09T22:49:44+05:30
Head is immersed in water becaise it is made up of strong and heavy bones and is completely occupied by brain so there is no space. but where as in other parts the slin is decomposed or some gas is entered into it there may be loss in weight of the body but where as the remains heavy. so head sinks into water.
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2014-10-09T23:23:14+05:30
In the case of adead body head has more weight  than the body.head having skull is more dense than body part .sodead body floats in water with its head immersed 
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