How is energy transferred from the sun, then cycled through all living organisms in an ecosystem?

I guess this the answer

Energy and nutrients are passed around through the food chain, when one organism eats another organism. So first plants absorb sunlight and then other organisms (herbivores) eat plants and then other organisms feed on those and so on

primary succession occurs in essentially lifeless areas regions in which the soil is incapable of sustaining life as a result of such factors as lava flows, newly formed sand dunes, or rocks left from a retreating glacier. secondary succession occurs