( ( ( Iron and ) ( the hemoglobin ) ) ( ( level ( in pregnancy ) ) . ) )
(ROOT (S (NP (NP (NNP Iron)) (CC and) (NP (DT the) (NN hemoglobin))) (VP (VBP level) (PP (IN in) (NP (NN pregnancy)))) (. .)))
Iron and the hemoglobin level in pregnancy.
(ROOT (S (NP (NNP Iron) (NNS ions)) (VP (VBP are) (ADJP (JJ critical) (PP (IN for) (NP (NP (DT the) (NN formation)) (PP (IN of) (NP (NN hemoglobin))))))) (. .)))