soil and rain water plus sun light.
During sunlight hours, plants produce oxygen as a gas and energy in the form of ATP. Animals use oxygen that the plant produces to form ATP it needs for energy. The animals produce carbon dioxide gas which the plant uses.
It needs energy from the sun or sunlight,water and minerals and carbon dioxide or CO2
Plants obtain energy from the sun.
Nutrients provide the energy and raw materials that the human body needs.
the plants need sunlight to produce their own food.
The equation for photosynthesis is co2+h2o+=c6h12o6+6o2+energy. That sounds complicated, but it's really not. All that means is that to produce glucose, energy, and oxygen (the glucose and the energy are what's needed), a plant needs Carbon Dioxide and water.
A secondary
An organism needs energy and constant supply of materials to grow and develop.
A producer is none of these. It uses sunlight (some use chemicals) to produce their energy needs. Most all producers are plants.
Biomass is a term used to measure the amount of energy in a biotic substance. Biomass is the energy that could be harvested from that plant. The plant itself doesn't produce biomass. Plants do produce O2 as a by-product of respiration, photosynthesis. Plants also produce various carbohydrates which are used by the plant to provide energy needs of the plant and nutrients necessary for the plants growth and ongoing processes.
carbohydrate
There are certain chemicals that the animal needs to 'recharge' its system. They also have not yet adapted to not relying on plants, like carnivores. Plants are probably abundant in many areas where animals that eat them live.