( ( The sun ) ( ( is ( ( the ( ultimate source ) ) ( of ( energy ( ( ( in ( most ecosystems ) ) and ) ( for ( ( almost all ) ( living things ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT The) (NN sun)) (VP (VBZ is) (NP (NP (DT the) (JJ ultimate) (NN source)) (PP (IN of) (NP (NP (NN energy)) (PP (PP (IN in) (NP (JJS most) (NNS ecosystems))) (CC and) (PP (IN for) (NP (QP (RB almost) (DT all)) (VBG living) (NNS things)))))))) (. .)))
The sun is the ultimate source of energy in most ecosystems and for almost all living things.
(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.