You decompose, bugs eat you, and Earth takes the rest. After that, all of your cells will disperse as proteins and waste in the bugs that ate you. Other animals will eat those bugs, and again be eaten by an even bigger animal. Eventually, all of your cells will have split into many different creatures, which may eventually be eaten by another human, and so forth.
If you're cremated, it's just the same as Earth taking you without the bug part, until your ashes end up somewhere that some worms might eat accidentally.