( ( Silurian ( first ( land ( arthropods ( and ( land plants ) ) ) ) ) ) . )
(ROOT (S (VP (VB Silurian) (NP (JJ first) (NN land) (NNS arthropods) (CC and) (NN land) (NNS plants))) (. .)))
Silurian first land arthropods and land plants.
(ROOT (S (NP (NP (DT The) (NN majority)) (PP (IN of) (NP (NNS arthropods)))) (VP (VBP live) (PP (IN on) (NP (NN land)))) (. .)))