( ( Energy ( ( ( moving ( from ( producers ( to ( primary consumers ) ) ) ) ) ( to ( secondary consumers ) ) ) ( and ( so on ) ) ) ) ( ( is ( called ( a ( food chain ) ) ) ) . ) )
(ROOT (S (NP (NP (NNP Energy)) (VP (VBG moving) (PP (IN from) (NP (NP (NNS producers)) (PP (TO to) (NP (JJ primary) (NNS consumers))))) (PP (TO to) (NP (JJ secondary) (NNS consumers))) (ADVP (CC and) (RB so) (IN on)))) (VP (VBZ is) (VP (VBN called) (NP (DT a) (NN food) (NN chain)))) (. .)))
Energy moving from producers to primary consumers to secondary consumers and so on is called a food chain.
(ROOT (S (NP (NNP Food) (NNS chains)) (VP (VBP carry) (NP (NN energy)) (PP (IN from) (NP (NP (NNS producers)) (PP (TO to) (NP (NNS consumers)))))) (. .)))