What is a characteristic of renewable energy sources like biomass?

Biomass is characterized as combustible because it consists of organic materials such as plant and animal waste that can be burned to produce energy. This combustion process releases energy in the form of heat, which can be utilized for generating electricity or powering vehicles.

The nature of biomass allows it to be a significant player in renewable energy, as it is derived from natural processes. When biomass materials are burned, they release carbon dioxide and other greenhouse gases, but a key aspect of biomass is that the carbon released during combustion is part of a short-term carbon cycle, as new plants absorb carbon dioxide as they grow, potentially balancing emissions over time if managed properly.

In contrast, renewable energy sources are aimed at minimizing reliance on fossil fuels and reducing carbon emissions. Hence, while the other options reflect attributes that do not accurately describe biomass, the combustibility of biomass is what makes it useful as a source of energy in sustainable practices.