Energy can be harnessed from the following sources A. Sun B. Sea C. Animal…

Concept

An energy source is a natural flow or material whose energy can be converted into useful heat, electricity, or fuel.

Renewable sources replenish naturally: sunlight can be converted by solar systems, sea motion or temperature differences can drive ocean-energy systems, and biodegradable animal waste can produce biogas.

Application

1. Sunlight provides solar energy through photovoltaic or solar-thermal conversion.

2. Sea water supports tidal, wave, and ocean-thermal energy conversion.

3. Animal excreta contains biodegradable organic matter that anaerobic digestion converts into methane-rich biogas.

4. Soil is a medium that supports ecosystems and plants, but it is not itself treated as an energy source in this classification.

Cross-check and contrast

• B, C and D only includes sea and animal excreta but substitutes soil for sunlight.

• A, D and C only includes sun and animal excreta but substitutes soil for sea.

• A, B and D only includes sun and sea but substitutes soil for animal excreta.

Result

Therefore, the complete source set is Sun, Sea and Animal excreta: A, B and C only.