( ( A Growing ) ( Population . ) )
(ROOT (S (NP (DT A) (VBG Growing)) (VP (VBZ Population)) (. .)))
A 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)) (. .)))