( ( In oceans ) ( , ( ( ( most primary ) production ) ( ( is ( performed ( by algae ) ) ) . ) ) ) )
(ROOT (S (PP (IN In) (NP (NNS oceans))) (, ,) (NP (ADJP (RBS most) (JJ primary)) (NN production)) (VP (VBZ is) (VP (VBN performed) (PP (IN by) (NP (NN algae))))) (. .)))
In oceans, most primary production is performed by algae.
(ROOT (S (NP (RBS Most) (JJ red) (NN algae) (NNS species)) (VP (VBP live) (PP (IN in) (NP (NNS oceans)))) (. .)))