( Microevolution ( ( is ( concerned ( with ( understanding ( ( the mechanisms ) ( responsible ( for ( ( imparting ( evolutionary change ) ) ( within ( populations ( over ( ( relatively short ) ( time periods ) ) ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNP Microevolution)) (VP (VBZ is) (ADJP (VBN concerned) (PP (IN with) (S (VP (VBG understanding) (S (NP (DT the) (NNS mechanisms)) (ADJP (JJ responsible) (PP (IN for) (S (VP (VBG imparting) (NP (JJ evolutionary) (NN change)) (PP (IN within) (NP (NP (NNS populations)) (PP (IN over) (NP (ADJP (RB relatively) (JJ short)) (NN time) (NNS periods))))))))))))))) (. .)))
Microevolution is concerned with understanding the mechanisms responsible for imparting evolutionary change within populations over relatively short time periods.
(ROOT (S (NP (NP (NNP Evolution)) (SBAR (WHNP (WDT that)) (S (VP (VBZ occurs) (PP (IN over) (NP (NP (DT a) (JJ short) (NN period)) (PP (IN of) (NP (NN time))))))))) (VP (VBZ is) (VP (VBN known) (PP (IN as) (NP (NN microevolution))))) (. .)))