( ( 3 -RRB- ) ( Tetrapods ( ( evolved ( more ( than once ) ) ) . ) ) )
(ROOT (S (LST (LS 3) (-RRB- -RRB-)) (NP (NNP Tetrapods)) (VP (VBD evolved) (ADVP (RBR more) (IN than) (RB once))) (. .)))
3) Tetrapods evolved more than once.
(ROOT (S (NP (NNS Caecillians)) (VP (VBD evolved) (PP (IN from) (NP (JJ tetrapod) (NNS ancestors)))) (. .)))