( ( ( The rest ) ( of ( the skeleton ) ) ) ( ( ( is primarily ) cartilage ) . ) )
(ROOT (S (NP (NP (DT The) (NN rest)) (PP (IN of) (NP (DT the) (NN skeleton)))) (VP (VBZ is) (ADVP (RB primarily)) (NP (NN cartilage))) (. .)))
The rest of the skeleton is primarily cartilage .
(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))))) (. .)))