( ( This ( common ( hand bone ) ) ) ( ( ( is proof ) ( that ( ( each ( of ( these ( mammalian species ) ) ) ) ( ( ( evolved ( from ( the ( same ancestor ) ) ) ) and ) ( further ( displays ( ( the evolution ) ( of ( organisms ( throughout history ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT This) (JJ common) (NN hand) (NN bone)) (VP (VBZ is) (NP (NN proof)) (SBAR (IN that) (S (NP (NP (DT each)) (PP (IN of) (NP (DT these) (JJ mammalian) (NN species)))) (VP (VP (VBD evolved) (PP (IN from) (NP (DT the) (JJ same) (NN ancestor)))) (CC and) (VP (ADVP (RBR further)) (VBZ displays) (NP (NP (DT the) (NN evolution)) (PP (IN of) (NP (NP (NNS organisms)) (PP (IN throughout) (NP (NN history))))))))))) (. .)))
This common hand bone is proof that each of these mammalian species evolved from the same ancestor and further displays the evolution of organisms throughout history.
(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.