( ( ( ( ( ( Most glaciers ) ( melt ( from above ) ) ) , ) and ) ( ( the ( energy source ) ) ( is ( ( sunlight and ) ( atmospheric heat ) ) ) ) ) . )
(ROOT (S (S (NP (JJS Most) (NNS glaciers)) (VP (VB melt) (PP (IN from) (ADJP (JJ above))))) (, ,) (CC and) (S (NP (DT the) (NN energy) (NN source)) (VP (VBZ is) (NP (NP (NN sunlight)) (CC and) (NP (JJ atmospheric) (NN heat))))) (. .)))
Most glaciers melt from above, and the energy source is sunlight and atmospheric heat.
(ROOT (S (NP (NP (JJS Most)) (PP (IN of) (NP (NP (NN food) (POS 's)) (NN chemical) (NN energy)))) (ADVP (RB ultimately)) (VP (VBZ comes) (PP (IN from) (NP (NN sunlight)))) (. .)))