Definition
Biomass is the total mass of living organisms in a given area or volume. It includes plants, animals, fungi, and even microorganisms. Think of a forest; the biomass includes all the trees, shrubs, insects, and soil organisms. It is often measured in terms of dry weight to exclude water content. Biomass can be used as a renewable energy source, like burning wood for heat. It contrasts with fossil fuels, which are derived from ancient organic matter. Understanding biomass is key to studying ecosystems and sustainable energy.