( ( for ( the ( growing population ) ) ) . )
(ROOT (FRAG (PP (IN for) (NP (DT the) (VBG growing) (NN population))) (. .)))
for the growing population.
(ROOT (S (SBAR (IN As) (S (NP (DT the) (NN population)) (VP (VBZ grows)))) (, ,) (NP (NP (NN competition)) (PP (IN for) (NP (NN food)))) (VP (VBZ grows)) (. .)))