( ( No ( ( externally sourced ) ( food aid ) ) ) ( ( is required ) . ) )
(ROOT (S (NP (DT No) (ADJP (RB externally) (JJ sourced)) (NN food) (NN aid)) (VP (VBZ is) (VP (VBN required))) (. .)))
No externally sourced food aid is required.
(ROOT (S (SBAR (IN Because) (S (NP (DT all) (NNS animals)) (VP (VBP require) (NP (NP (DT an) (JJ external) (NN source)) (PP (IN of) (NP (NN food))))))) (, ,) (NP (PRP they)) (VP (VBP are) (VP (VBN called) (S (ADJP (JJ heterotrophic))))) (. .)))