( ( 8 weeks ) ( ( ( The beginnings ) ( of ( all ( major ( body organs ) ) ) ) ) ( ( are formed ) . ) ) )
(ROOT (S (NP (CD 8) (NNS weeks)) (NP (NP (DT The) (NNS beginnings)) (PP (IN of) (NP (DT all) (JJ major) (NN body) (NNS organs)))) (VP (VBP are) (VP (VBN formed))) (. .)))
8 weeks The beginnings of all major body organs are formed.
(ROOT (S (PP (IN By) (NP (CD 8) (NNS weeks))) (, ,) (NP (DT all) (JJ major) (NNS organs)) (VP (VBP start) (S (VP (VBG developing)))) (. .)))