( ( Primary consumers ) ( ( ( are also ) ( known ( as heterotrophs ) ) ) . ) )
(ROOT (S (NP (JJ Primary) (NNS consumers)) (VP (VBP are) (ADVP (RB also)) (VP (VBN known) (PP (IN as) (NP (NNS heterotrophs))))) (. .)))
Primary consumers are also known as heterotrophs.
(ROOT (S (NP (NNS Heterotrophs)) (VP (VBZ is) (NP (NP (DT another) (NN name)) (PP (IN for) (NP (NNS consumers))))) (. .)))