( ( Animals ( that ( ( do not ) ( ( ( make ( their ( own food ) ) ) and ) ( ( ( receive energy ) ( from ( the sun ) ) ) ( by ( eating ( other ( living things ) ) ) ) ) ) ) ) ) ( ( are ( called heterotrophs ) ) . ) )
(ROOT (S (NP (NP (NNS Animals)) (SBAR (WHNP (WDT that)) (S (VP (VBP do) (RB not) (VP (VP (VB make) (NP (PRP$ their) (JJ own) (NN food))) (CC and) (VP (VB receive) (NP (NN energy)) (PP (IN from) (NP (DT the) (NN sun))) (PP (IN by) (S (VP (VBG eating) (NP (JJ other) (VBG living) (NNS things))))))))))) (VP (VBP are) (VP (VBN called) (NP (NNS heterotrophs)))) (. .)))
Animals that do not make their own food and receive energy from the sun by eating other living things are called heterotrophs.
(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))))) (. .)))