( ( ( The fact ) ( of ( ( artificial selection ) ( in breeding ) ) ) ) ( alone ( ( falsifies ( this contention ) ) . ) ) )
(ROOT (S (NP (NP (DT The) (NN fact)) (PP (IN of) (NP (NP (JJ artificial) (NN selection)) (PP (IN in) (NP (NN breeding)))))) (ADVP (RB alone)) (VP (VBZ falsifies) (NP (DT this) (NN contention))) (. .)))
The fact of artificial selection in breeding alone falsifies this contention.
(ROOT (S (NP (NNS Humans)) (VP (VBP create) (NP (NP (JJ different) (NNS breeds)) (PP (IN of) (NP (NP (NNS organisms)) (VP (VBG using) (NP (JJ artificial) (NN selection))))))) (. .)))