you use glad wrap
To preserve a jack o' lantern and make it last longer, you can try coating the cut edges with petroleum jelly, keeping it in a cool place when not on display, and spraying it with a mixture of water and bleach to prevent mold growth.
Janet Godfrey is actually Bruce's second wife. Nobody (except her and Jack, I guess) knows the name of his first wife. Jack hasn't declined to mention it, since it was a very short marriage. I presume he wishes to preserve the lady's privacy.
Preserve means keep, maintain. For example, to "preserve the Union" would mean to keep it from falling apart into independent states.
how did they preserve the body
The brain was disposed of. They did not preserve it.
I preserve my loving family.
how do you preserve the bud of a flower
On meat, salt can preserve food.
It was written to preserve the states' sovereignty.
You can preserve a flower petal by dehydrating it.
Plain water does not preserve fruits.
the same as you preserve a mummy, i think.