( ( Human activity ) ( ( caused ( ( ( the ( two extinctions ) ) and ) ( ( the decline ) ( of ( the ( other ( three species ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNP Human) (NN activity)) (VP (VBD caused) (NP (NP (DT the) (CD two) (NNS extinctions)) (CC and) (NP (NP (DT the) (NN decline)) (PP (IN of) (NP (DT the) (JJ other) (CD three) (NNS species)))))) (. .)))
Human activity caused the two extinctions and the decline of the other three species.
(ROOT (S (NP (NNP Human) (NNP overpopulation)) (VP (VBZ is) (VP (VP (VBG crowding) (PRT (RP out)) (NP (JJ other) (NNS species))) (CC and) (VP (VBG making) (S (NP (NP (PDT all) (DT the) (JJ other) (NNS causes)) (PP (IN of) (NP (NN extinction)))) (ADJP (RBR worse)))))) (. .)))