( ( ( The importance ) ( of ( meiosis ( for ( sexual reproduction ) ) ) ) ) ( ( was stressed ) . ) )
(ROOT (S (NP (NP (DT The) (NN importance)) (PP (IN of) (NP (NP (NNS meiosis)) (PP (IN for) (NP (JJ sexual) (NN reproduction)))))) (VP (VBD was) (VP (VBN stressed))) (. .)))
The importance of meiosis for sexual reproduction was stressed.
(ROOT (S (NP (JJ Sexual) (NN reproduction)) (ADVP (RB usually)) (VP (VBP occur) (PP (IN during) (NP (NP (NNS times)) (PP (IN of) (NP (JJ environmental) (NN stress)))))) (. .)))