Concept:Terrestrial ecosystems are powered mainly by sunlight, which supports life through energy capture.
Explanation:Solar energy reaches Earth and provides the light needed for photosynthesis.
Plants use this energy to produce food and oxygen.
The energy stored in plants is then transferred along food chains to animals and decomposers.
Geothermal, nuclear, and hydroelectric power do not directly drive the natural energy flow of land-based ecosystems.
Therefore, sunlight is the original and major power source for most terrestrial ecosystems.
Answer:C. solar energy.