( ( Evolution ( , ( microevolution ( , ( and macroevolution ) ) ) ) ) ( ( are ( defined ( by biologists ) ) ) . ) )
(ROOT (S (NP (NNP Evolution) (, ,) (NNP microevolution) (, ,) (CC and) (NNP macroevolution)) (VP (VBP are) (VP (VBN defined) (PP (IN by) (NP (NNS biologists))))) (. .)))
Evolution, microevolution, and macroevolution are defined by biologists.
(ROOT (S (NP (NNP Macroevolution)) (VP (VBZ happens) (SBAR (WHADVP (WRB when)) (S (NP (NP (NNS forces)) (PP (IN of) (NP (NN evolution)))) (VP (VBP work) (PP (IN over) (NP (NP (DT a) (JJ long) (NN period)) (PP (IN of) (NP (NN time))))))))) (. .)))