( ( ( Species Populations ) ( of ( organisms ( that ( may ( ( interbreed and ) ( produce fertile ) ) ) ) ) ) ) ( ( offspring ( having ( ( ( ( ( ( similar structure ) , ) habits ) , ) and ) functions ) ) ) . ) )
(ROOT (S (NP (NP (NNP Species) (NNP Populations)) (PP (IN of) (NP (NP (NNS organisms)) (SBAR (WHNP (WDT that)) (S (VP (MD may) (VP (VP (VB interbreed)) (CC and) (VP (VB produce) (ADJP (JJ fertile)))))))))) (VP (VBZ offspring) (S (VP (VBG having) (NP (NP (JJ similar) (NN structure)) (, ,) (NP (NNS habits)) (, ,) (CC and) (NP (NNS functions)))))) (. .)))
Species Populations of organisms that may interbreed and produce fertile offspring having similar structure, habits, and functions.
(ROOT (S (SBAR (IN If) (S (NP (CD two) (NNS populations)) (VP (VBP do) (RB not) (VP (VB mate) (CC and) (VB produce) (NP (ADJP (JJ fertile)) (NN offspring)))))) (, ,) (NP (JJ separate) (NNS species)) (VP (VBP result)) (. .)))