fossil fuels
Fossil Fuels such as coal, oil, and natural gas.
Animals and fungi that must depend on autotrophs for their food energy are called consumers. These consumers are also called heterotrophs.
fossil fuel
fossil fuel
fossil fuel
Petroleum is called a fossil fuel because it was made from the remains of plants. The energy in petroleum came from the energy in the plants and animals.
The original source of oil is the dead life forms. The hydrocarbons from the life forms are usually buried so that they do not combine with oxygen. When the hydrocarbons become more saturated with hydrogen, they form oil.
fossil fuels
Coal
The only energy resource that is formed by such materials is fossil fuel.
Producers produce food using energy, and decomposers eat the remains of dead animals to get energy.
A resource formed mainly from the remains of microscopic-sized marine organisms buried beneath the ground petroleum. The kind of energy produced when billions of atomic nuclei from uranium are split apart in a fission reaction is nuclear.