( ( Reproduction Reproduction ) ( ( is ( ( sexual or ) asexual ) ) . ) )
(ROOT (S (NP (NNP Reproduction) (NNP Reproduction)) (VP (VBZ is) (ADJP (JJ sexual) (CC or) (JJ asexual))) (. .)))
Reproduction Reproduction is sexual or asexual.
(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)))))) (. .)))