( ( ( ( ( At ( ( the end ) ( of ( week 10 ) ) ) ) ( ( the ( embryonic period ) ) ( is complete ) ) ) and ) ( ( the ( fetal period ) ) begins ) ) . )
(ROOT (S (S (PP (IN At) (NP (NP (DT the) (NN end)) (PP (IN of) (NP (NN week) (CD 10))))) (NP (DT the) (JJ embryonic) (NN period)) (VP (VBZ is) (ADJP (JJ complete)))) (CC and) (S (NP (DT the) (JJ fetal) (NN period)) (VP (VBZ begins))) (. .)))
At the end of week 10 the embryonic period is complete and the fetal period begins.
(ROOT (S (NP (DT The) (JJ fetal) (NN period)) (VP (VBZ lasts) (NP (NP (QP (RB approximately) (CD 30)) (NNS weeks)) (NP (NNS weeks)))) (. .)))