Decay is a word for dead things/rot.
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Things rot because fungi ,Bactria or a virus grows on things that once lived or grew and eventually it is all gone and the rest lies on the ground ))))))))
Eventually Yes they do, as all other organic things. It does take more time than for example a leaf to rot, but yes, it does rot.
depends on the thing
various decomposers such as bacteria and fungus
When you dont preserve things and leave them out to rot.
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As in all things, it will undergo decomposition and decay
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rot and other dirty things
apples coke tea coffe not really