( This ( ( confirms ( ( the ( ( very low ) toxicity ) ) ( of biodiesel ) ) ) . ) )
(ROOT (S (NP (DT This)) (VP (VBZ confirms) (NP (NP (DT the) (ADJP (RB very) (JJ low)) (NN toxicity)) (PP (IN of) (NP (NN biodiesel))))) (. .)))
This confirms the very low toxicity of biodiesel .
(ROOT (S (NP (NP (DT The) (JJ main) (NN advantage)) (PP (IN of) (NP (NN urea)))) (VP (VBZ is) (NP (PRP$ its) (ADJP (RB very) (JJ low)) (NN toxicity))) (. .)))