Meat stays in the gut longer than vegetable matter.和蔬菜相比，肉类在消化道中停留的时间更长。In order to decompose, all vegetable matter needs supplies of nitrogen.所有植物性物质的分解都需要氮气的供应。Most vegetable matter is compostable.绝大部分蔬菜都可以用作堆肥。They feed mostly on decaying vegetable matter.它们大多以腐烂的蔬菜为食。