( ( ( The ( phylogenetic relationship ) ) ( of ( lungfish ( to ( ( ( ( the ( last ( common ancestor ) ) ) ( of tetrapods ) ) and ) ( ( their ( ( close morphological ) similarity ) ) ( to ( their ( fossil ancestors ) ) ) ) ) ) ) ) ) ( ( make ( ( this species ) ( uniquely interesting ) ) ) . ) )
(ROOT (S (NP (NP (DT The) (JJ phylogenetic) (NN relationship)) (PP (IN of) (NP (NP (NN lungfish)) (PP (TO to) (NP (NP (NP (DT the) (JJ last) (JJ common) (NN ancestor)) (PP (IN of) (NP (NNS tetrapods)))) (CC and) (NP (NP (PRP$ their) (ADJP (RB close) (JJ morphological)) (NN similarity)) (PP (TO to) (NP (PRP$ their) (JJ fossil) (NNS ancestors))))))))) (VP (VBP make) (S (NP (DT this) (NNS species)) (ADJP (RB uniquely) (JJ interesting)))) (. .)))
The phylogenetic relationship of lungfish to the last common ancestor of tetrapods and their close morphological similarity to their fossil ancestors make this species uniquely interesting.
(ROOT (S (NP (NNS Caecillians)) (VP (VBD evolved) (PP (IN from) (NP (JJ tetrapod) (NNS ancestors)))) (. .)))