A. Air & Water
B. Plants & Animals
C. Birds
D. Oceans
🧠 Explanation:
Bio-fuels are energy sources derived from plants and animals, such as ethanol from corn or biodiesel from vegetable oils. Renewable and eco-friendly, they reduce reliance on fossil fuels, lowering emissions. Used in transportation and power generation, bio-fuels support sustainability. Their production involves agriculture and biotechnology, impacting global energy markets. Understanding bio-fuels is crucial for studying renewable energy, environmental science, and climate change solutions, highlighting their role in reducing carbon footprints and fostering sustainable development in energy sectors worldwide.
