( Phytoplankton ( ( ( manufacture ( their ( own food ) ) ) ( using ( ( a process ) ( of photosynthesis ) ) ) ) . ) )
(ROOT (S (NP (NNP Phytoplankton)) (VP (VBP manufacture) (NP (PRP$ their) (JJ own) (NN food)) (S (VP (VBG using) (NP (NP (DT a) (NN process)) (PP (IN of) (NP (NN photosynthesis))))))) (. .)))
Phytoplankton manufacture their own food using a process of photosynthesis.
(ROOT (S (NP (NNP Phytoplankton)) (VP (VBP make) (NP (NP (NN food)) (PP (IN via) (NP (NN photosynthesis))))) (. .)))