( Antarctica ( ( is ( ( the ( only continent ) ) ( that ( ( does not ) ( have ( a ( land ( mammal population ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNP Antarctica)) (VP (VBZ is) (NP (NP (DT the) (JJ only) (NN continent)) (SBAR (WHNP (WDT that)) (S (VP (VBZ does) (RB not) (VP (VB have) (NP (DT a) (NN land) (NN mammal) (NN population)))))))) (. .)))
Antarctica is the only continent that does not have a land mammal population.
(ROOT (S (NP (NNP Antarctica)) (VP (VBZ is) (NP (NP (DT the) (JJ only) (NN continent)) (PP (IN without) (NP (NNS amphibians))))) (. .)))