( ( ( D -RRB- ) ( It ( must ( be ( sexually reproducing ) ) ) ) ) . )
(ROOT (SQ (VP (VB D) (-RRB- -RRB-) (NP (NP (PRP It)) (SBAR (S (VP (MD must) (VP (VB be) (VP (ADVP (RB sexually)) (VBG reproducing)))))))) (. .)))
D) It must be sexually reproducing.
(ROOT (S (NP (NNS Vertebrates)) (VP (VB reproduce) (ADVP (RB sexually))) (. .)))