Organisms give off organic matter before they die

That becomes detritus,the base of what we call the brown food chain,which looks more like this.What happens to plants also happens to all other organisms up the food chain:some are eaten alive,but most are eaten only when they're dead and rotting.And all along this food chain,living things shed organic matter and expel digestive waste before dying and leaving their remains to decay.All that death sounds grim, right?