( ( grow food ) ; )
(ROOT (S (VP (VB grow) (NP (NN food))) (: ;)))
grow food;
(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)) (. .)))