( Reproduction ( ( ( is usually ) sexual ) . ) )
(ROOT (S (NP (NNP Reproduction)) (VP (VBZ is) (ADVP (RB usually)) (ADJP (JJ sexual))) (. .)))
Reproduction is usually sexual.
(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)))))) (. .)))