SAPROPHYTES : Saprophytes are living organisms that live and feed on the remains of other organisms i.e on dead and decaying organisms. Saprophytes, also known as saprotrophs. They are immensely important for soil biology. They degrade complex organic matter into simpler substances that plants can use for a variety of metabolic activities. As a result, saprophytes play an important role in the environment.Though fungi (e.g., mushrooms, yeast, Penicillium, etc.) are among the most common saprophytes, it's worth noting that flowering plants and bacteria are also included in this category.Saprophytes contribute to nutrient cycling by BREAKING down dead and decaying organic matter.Saprophytes digest dead and rotting matter by extracellular digestion. They secrete digestive enzymes into the system, which break down organic matter into simpler substances. The nutrients produced in this manner are absorbed directly through the organisms' cell membranes.MushroomSome mushrooms can be seen acting like saprophytes by obtaining nutrition from dead organic material. Many mushrooms, such as those found only on dead wood, are exclusively saprophytes.YeastYeast can be found in abundance on sugary substances.It can be found in large quantities in grape juice, flower nectar, and vineyards.Under FAVORABLE conditions, it reproduces by budding.It takes its nutrition from decaying matter. Mucor Mucor, also known as mold, is a SAPROPHYTIC fungus that grows abundantly on decayed organic matter, ESPECIALLY those high in carbohydrates—starch and sugar.Mucor can be found in soft white cottony patches on rotting bread, tomatoes, and dung. It reproduces both sexually and asexually.Explanation - Mushroom, yeast, mucor are examples of saprophytic organisms that is, the organism that feeds on dead and decaying organic matter as their source of nutrition.So the correct option is - all of the above.