What term refers to combustible renewable energy sources including wood and plants?

The term that refers to combustible renewable energy sources, including wood and plants, is biomass. Biomass is organic material that comes from plants and animals, and it can be used to produce energy through combustion or conversion processes. When biomass is burned, it releases stored energy in the form of heat, which can be harnessed for cooking, heating, or generating electricity.

Biomass is considered a renewable energy source because it can be replenished naturally as plants and crops grow again over time. This distinguishes it from fossil fuels, which are finite resources. The use of biomass for energy can help reduce waste by utilizing organic materials that would otherwise decompose in landfills, thus contributing to a more sustainable energy system.

In contrast, fuel cells generate electricity through electrochemical reactions, solar energy harnesses power from sunlight, and geothermal energy extracts heat from beneath the Earth's surface, none of which directly involve the combustion of organic materials like biomass does.