A fuel derived from a biological source is commonly referred to as what?

The term "biofuel" specifically refers to fuel that is produced from biological materials, such as plants or animal waste. This can include a variety of renewable resources, like corn, sugarcane, or vegetable oils, which can be converted into fuels such as ethanol or biodiesel. The use of biofuels is associated with a lower carbon footprint when compared to fossil fuels, as they can be more sustainable and often produce fewer greenhouse gas emissions when burned.

In contrast, fossil fuels, which include coal and natural gas, are derived from geological processes over millions of years from ancient organic matter. These fuels are non-renewable and contribute significantly to environmental issues related to climate change. Therefore, while the other options pertain to different types of fuels, only biofuel is recognized for its biological origin and renewable nature.