The correct answer is Sun.
Plants and animals are made of organic materials. The organic materials are the biomass and is a renewable source of energy. Biomass stores energy that captured from the Sun. Green plants absorb energy from the Sun during the process of photosynthesis. Examples of biomass are wood chips, paper, and manure (obtained from animal and plants wastes). Thus, Sun is the ultimate y source of energy from which biomass is formed.
