( Sunlight ( ( is ( ( the ( main ( energy source ) ) ) ( for ( life ( on Earth ) ) ) ) ) . ) )
(ROOT (S (NP (NNP Sunlight)) (VP (VBZ is) (NP (NP (DT the) (JJ main) (NN energy) (NN source)) (PP (IN for) (NP (NP (NN life)) (PP (IN on) (NP (NNP Earth))))))) (. .)))
Sunlight is the main energy source for life on Earth.
(ROOT (S (NP (NNP Sunlight)) (VP (VBZ is) (NP (NP (DT the) (JJ main) (NN source)) (PP (IN of) (NP (NP (NN energy)) (PP (IN for) (NP (NP (DT all)) (PP (IN of) (NP (NP (DT the) (NNS organisms)) (PP (IN in) (NP (JJS most) (NN food) (NNS chains))))))))))) (. .)))
Sunlight is the main source of energy for all of the organisms in most food chains.