( So ( ( all organisms ) ( , ( ( ( directly or ) indirectly ) ( , ( ( ( get ( their energy ) ) ( from ( the Sun ) ) ) . ) ) ) ) ) )
(ROOT (S (IN So) (NP (DT all) (NNS organisms)) (, ,) (ADVP (RB directly) (CC or) (RB indirectly)) (, ,) (VP (VBP get) (NP (PRP$ their) (NN energy)) (PP (IN from) (NP (DT the) (NNP Sun)))) (. .)))
So all organisms, directly or indirectly, get their energy from the Sun.
(ROOT (S (NP (NP (JJS Most)) (PP (IN of) (NP (NP (DT the) (NN energy)) (VP (VBN used) (PP (IN by) (NP (VBG living) (NNS things))))))) (VP (VBZ comes) (ADVP (CC either) (RB directly) (CC or) (RB indirectly)) (PP (IN from) (NP (DT the) (NN sun)))) (. .)))
Most of the energy used by living things comes either directly or indirectly from the sun.