( ( Plankton ( that ( are plants ) ) ) ( ( are ( ( ( ( called algae ) , ) or ) phytoplankton ) ) . ) )
(ROOT (S (NP (NP (NNP Plankton)) (SBAR (WHNP (WDT that)) (S (VP (VBP are) (NP (NNS plants)))))) (VP (VBP are) (VP (VP (VBN called) (S (ADJP (JJ algae)))) (, ,) (CC or) (VP (VBN phytoplankton)))) (. .)))
Plankton that are plants are called algae, or phytoplankton .
(ROOT (S (NP (NNP Phytoplankton)) (VP (VBP make) (NP (NP (NN food)) (PP (IN via) (NP (NN photosynthesis))))) (. .)))