( ( ( The 1 ) ( in ( ( -LRB- ( ( 2.5 cm ) -RRB- ) ) ( long fetus ) ) ) ) ( ( has ( ( ( a ( complete ( cartilage skeleton ) ) ) , ) ( which ( is ( ( replaced ( by ( bone cells ) ) ) ( by ( ( month 's ) end ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (DT The) (CD 1)) (PP (IN in) (NP (PRN (-LRB- -LRB-) (NP (QP (CD 2.5) (CD cm))) (-RRB- -RRB-)) (JJ long) (NN fetus)))) (VP (VBZ has) (NP (NP (DT a) (JJ complete) (NN cartilage) (NN skeleton)) (, ,) (SBAR (WHNP (WDT which)) (S (VP (VBZ is) (VP (VBN replaced) (PP (IN by) (NP (NN bone) (NNS cells))) (PP (IN by) (NP (NP (NN month) (POS 's)) (NN end))))))))) (. .)))
The 1 in (2.5 cm) long fetus has a complete cartilage skeleton, which is replaced by bone cells by month's end.
(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))))) (. .)))