( All ( populations ( of ( ( all species ) ( in ( a habitat ) ) ) ) ) )
(ROOT (NP (NP (DT All)) (NP (NP (NNS populations)) (PP (IN of) (NP (NP (DT all) (NN species)) (PP (IN in) (NP (DT a) (NN habitat))))))))
All populations of all species in a habitat
(ROOT (S (NP (NP (DT All) (NNS members)) (PP (IN of) (NP (DT a) (NN species) (NN living)))) (ADVP (RB together)) (VP (VB form) (NP (DT a) (PRN (-LRB- -LRB-) (NP (NN n)) (-RRB- -RRB-)) (NN population))) (. .)))