( ( ( ( Structure and ) function ) ( of ecosystems ) ) ( ( ( is also ) ( studied ( including ( ( ( ( ( ( the role ) ( of photosynthesis ) ) , ) ( flow ( of matter ) ) ) and ) ( energy ( through ( ( ( food chains ) and ) ( trophic levels ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (NN Structure) (CC and) (NN function)) (PP (IN of) (NP (NNS ecosystems)))) (VP (VBZ is) (ADVP (RB also)) (VP (VBN studied) (PP (VBG including) (NP (NP (NP (DT the) (NN role)) (PP (IN of) (NP (NN photosynthesis)))) (, ,) (NP (NP (NN flow)) (PP (IN of) (NP (NN matter)))) (CC and) (NP (NP (NN energy)) (PP (IN through) (NP (NP (NN food) (NNS chains)) (CC and) (NP (JJ trophic) (NNS levels))))))))) (. .)))
Structure and function of ecosystems is also studied including the role of photosynthesis, flow of matter and energy through food chains and trophic levels.
(ROOT (S (NP (NN Pyramid) (NN ecosystem)) (VP (VBZ is) (VP (VBN used) (S (VP (TO to) (VP (VB show) (NP (NN energy) (NN flow)) (PP (IN through) (NP (DT the) (JJ trophic) (NNS levels)))))))) (. .)))
Pyramid ecosystem is used to show energy flow through the trophic levels.