( ( Some species ) ( ( ( ( hatch ( ( already ( completely metamorphosed ) ) ( into ( the ( adult form ) ) ) ) ) , ) ( while ( others ( still ( have ( tails ( when ( they hatch ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT Some) (NNS species)) (VP (VBP hatch) (ADJP (ADJP (RB already) (RB completely) (JJ metamorphosed)) (PP (IN into) (NP (DT the) (JJ adult) (NN form)))) (, ,) (SBAR (IN while) (S (NP (NNS others)) (ADVP (RB still)) (VP (VBP have) (NP (NP (NNS tails)) (SBAR (WHADVP (WRB when)) (S (NP (PRP they)) (VP (VBP hatch))))))))) (. .)))
Some species hatch already completely metamorphosed into the adult form, while others still have tails when they hatch.
(ROOT (S (NP (NN Fish)) (VP (VBP hatch) (PP (IN into) (NP (NP (NN larvae)) (SBAR (WHNP (WDT that)) (S (VP (VBP are) (ADJP (JJ different) (PP (IN from) (NP (NP (DT the) (JJ adult) (NN form)) (PP (IN of) (NP (NNS species)))))))))))) (. .)))