Nutrients and energy.
photosynthesis
Kinda, a producer provides food for all the heterotrophs in an ecosystem, a heterotroph being any organism that consume other organisms for energy. However, sunlight provides food for the producer, so indirectly sunlight provides food for an ecosystem.
the carp provides a good food source for a lot of very important animals
The sun is the energy source that provides heat and light for all of Earth's food chains through the process of photosynthesis. Solar energy is converted into chemical energy by plants, which is then transferred through the food chain to sustain life on Earth.
The river provides the locals living there with a source of food (fishes) and a source of water. It also provides the locals with a transport route to travel for easy accessibility.
Sugar is a calorie rich food source, it provides a good deal of energy for a small volume of food.
The endosperm provides food for the growing embryo in seeds, serving as a source of nutrients such as carbohydrates, proteins, and fats to support early seed development until the plant can photosynthesize on its own.
endosperm provides the seed with the energy to grow as it is the seeds source of food.
Sunlight
Turkey farming is a large source of income for many people. It is a growing and valued business, that provides not only jobs, but provides for a secondary business such as hatcheries. Turkey farming also provides a source of food, which is readily purchased from the stores every year.
Niger River. It is a vital source of life. Provides food, water, and drainage.
Cooked chard provides 10.5 micrograms of biotin per 175-gram serving.