( ( ( Cartilage and ) bone ) ( ( ( make up ) skeletons ) . ) )
(ROOT (S (NP (NN Cartilage) (CC and) (NN bone)) (VP (VBP make) (PRT (RP up)) (NP (NNS skeletons))) (. .)))
Cartilage and bone make up skeletons.
(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))))) (. .)))