( ( In ( attempting ( to ( measure biodiversity ) ) ) ) ( , ( it ( ( ( is ( physically impossible ) ) ( to ( ( inventory ( every species ) ) ( on ( a site ) ) ) ) ) . ) ) ) )
(ROOT (S (PP (IN In) (S (VP (VBG attempting) (S (VP (TO to) (VP (VB measure) (ADVP (RB biodiversity)))))))) (, ,) (NP (PRP it)) (VP (VBZ is) (ADJP (RB physically) (JJ impossible)) (S (VP (TO to) (VP (VB inventory) (NP (DT every) (NN species)) (PP (IN on) (NP (DT a) (NN site))))))) (. .)))
In attempting to measure biodiversity, it is physically impossible to inventory every species on a site.
(ROOT (S (NP (NNP Biodiversity)) (VP (VBZ is) (NP (NP (DT a) (NN measurement)) (PP (IN of) (NP (NP (DT the) (NN amount)) (PP (IN of) (NP (NP (NN variation)) (PP (IN of) (NP (NP (DT the) (NN species)) (PP (IN in) (NP (DT a) (VBN given) (NN area))))))))))) (. .)))