( ( ( Well-developed ( internal skeleton ) ) ( of ( ( cartilage and ) bone ) ) ) ( , ( ( separated ( into ( ( ( ( ( axial skeleton ) ( -LRB- ( ( ( ( ( ( ( skull , ) vertebrae ) , ) ribs ) , ) sternum ) -RRB- ) ) ) and ) ( appendicular skeleton ) ) ( -LRB- ( ( ( girdles and ) appendages ) -RRB- ) ) ) ) ) . ) ) )
(ROOT (S (NP (NP (JJ Well-developed) (JJ internal) (NN skeleton)) (PP (IN of) (NP (NN cartilage) (CC and) (NN bone)))) (, ,) (VP (VBN separated) (PP (IN into) (NP (NP (JJ axial) (NN skeleton)) (PRN (-LRB- -LRB-) (NP (NP (NN skull)) (, ,) (NP (NN vertebrae)) (, ,) (NP (NNS ribs)) (, ,) (NP (NN sternum))) (-RRB- -RRB-)) (CC and) (NP (NN appendicular) (NN skeleton)) (PRN (-LRB- -LRB-) (NP (NP (NNS girdles)) (CC and) (NP (NNS appendages))) (-RRB- -RRB-))))) (. .)))
Well-developed internal skeleton of cartilage and bone, separated  into axial skeleton (skull, vertebrae, ribs, sternum) and appendicular  skeleton (girdles and appendages).
(ROOT (S (ADVP (RB Early) (PP (IN in) (NP (NP (DT the) (NN development)) (PP (IN of) (NP (DT a) (JJ human) (NN fetus)))))) (, ,) (NP (DT the) (NN skeleton)) (VP (VBZ is) (VP (VBN made) (ADVP (RB entirely)) (PP (IN of) (NP (NN cartilage))))) (. .)))