Minecraft wiki entry for Things_not_to_do, associated text: For instance, rotten flesh is not only an efficient food for wolves, but it also makes a great emergency food for players. Also, if the player wants emeralds, they can use rotten flesh to trade with villagers for emeralds (clerics). Another example item is cobblestone. It can be used to create great emergency tools, smelted for experience points on demand, be crafted into many different things, or used as a useful, everyday building block. Seeds can be used to make bone meal in composters, or can be fed to chickens to breed them – providing a healthy source of experience points in the process.