( ( ( ( ( ( ( New species ) ( of ( ( animals and ) plants ) ) ) ( have arisen ) ) , ) and ) ( ( geologic structures ) ( change ( with time ) ) ) ) . )
(ROOT (S (S (NP (NP (NNP New) (NNS species)) (PP (IN of) (NP (NNS animals) (CC and) (NNS plants)))) (VP (VBP have) (VP (VBN arisen)))) (, ,) (CC and) (S (NP (JJ geologic) (NNS structures)) (VP (VBP change) (PP (IN with) (NP (NN time))))) (. .)))
New species of animals and plants have arisen, and geologic structures change with time.
(ROOT (S (NP (NP (DT The) (NN conclusion)) (SBAR (IN that) (S (NP (CD two) (NN animal) (NNS species)) (VP (VBD evolved) (PP (IN from) (NP (DT a) (JJ common) (NN ancestor))) (PP (IN in) (NP (JJ recent) (JJ geological) (NN history))))))) (VP (VBZ is) (ADVP (RBS best)) (VP (VBN supported) (PP (IN by) (NP (DT the) (NN observation))) (SBAR (IN that) (S (NP (DT the) (NNS species)) (VP (VBP have) (NP (JJ similar) (NN bone) (NN structure))))))) (. .)))
The conclusion that two animal species evolved from a common ancestor in recent geological history is best supported by the observation that the species have similar bone structure.