DEAD and decaying substances.Saprophytes (animals that follow saprophytic nutrition) feed on dead and DECAYED organisms for energy.They are an important part of the ecosystem as they help to keep our ENVIRONMENT clean and recycle nutrients back into the ecosystem.Some examples of saprophytes are fungi and certain types of bacteria.These are also responsible for the staling of bread and other similar food products.Saprophytes release certain enzymes to act on complex organic matter.It works by breaking it down into its constituents, which can be easily consumed by them.In NATURE, organisms exhibit VARIOUS types of heterotrophic nutrition. Holozoic NutritionSaprophytic NutritionParasitic NutritionHolozoic Nutrition - The mode of nutrition in which the digestion of food is allowed only after the ingestion of food.Parasitic Nutrition - The mode of nutrition in which organisms feed themselves by depending on the host or on other living organisms.An organism having the following modes of nutrition are:Saprophytic – FungiParasitic – PlasmodiumHolozoic – Human Beings