( ( autotrophs ( / ( ( primary ( trophic level ) ) ( ( ( with ( the ( greatest biomass ) ) ) . ) ( At this ) ) ) ) ) ( ( level ( ( the plants ) ( ( ( absorb sunlight ) and ) ( ( convert it ) ( to ( ( ( chemical energy ) ( -LRB- ( glucose -RRB- ) ) ) ( via photosynthesis ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (NNS autotrophs)) (PRN (: /) (FRAG (NP (JJ primary) (JJ trophic) (NN level)) (PP (IN with) (NP (DT the) (JJS greatest) (NNS biomass)) (. .)) (PP (IN At) (NP (DT this)))))) (VP (VBP level) (S (NP (DT the) (NNS plants)) (VP (VP (VB absorb) (NP (NN sunlight))) (CC and) (VP (VB convert) (NP (PRP it)) (PP (TO to) (NP (NP (NP (NN chemical) (NN energy)) (PRN (-LRB- -LRB-) (NP (NN glucose)) (-RRB- -RRB-))) (PP (IN via) (NP (NN photosynthesis))))))))) (. .)))
autotrophs / primary trophic level with the greatest biomass.  At this level the plants absorb sunlight and convert it to chemical energy (glucose) via photosynthesis.
(ROOT (S (PP (IN During) (NP (NN photosynthesis))) (, ,) (NP (NP (NN energy)) (PP (IN from) (NP (DT the) (NN sun)))) (VP (VBZ is) (VP (VBN converted) (PP (TO to) (NP (NN glucose))) (PP (IN after) (S (VP (VBG entering) (NP (DT a) (NN plant))))))) (. .)))