( ( ( The ( lowest part ) ) ( of ( the ( food chain ) ) ) ) ( ( are ( ( ( ( ( ( the plants ) . ) ( They ( are ( ( called producers ) ( because ( they ( produce ( ( their ( own food ) ) ( ( using ( ( the ( sunlight 's ) ) energy ) ) . ) ) ) ) ) ) ) ) ) ( ( This process ) ( ( is ( called photosynthesis ) ) . ) ) ) ( Animals ( ( are ( ( the consumers ) ( of ( the ( food chain ) ) ) ) ) . ) ) ) ( They ( eat ( other ( ( plants and ) animals ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (DT The) (JJS lowest) (NN part)) (PP (IN of) (NP (DT the) (NN food) (NN chain)))) (VP (VBP are) (S (S (FRAG (NP (DT the) (NNS plants)) (. .)) (NP (PRP They)) (VP (VBP are) (VP (VBN called) (NP (NNS producers)) (SBAR (IN because) (S (NP (PRP they)) (VP (VBP produce) (FRAG (NP (PRP$ their) (JJ own) (NN food)) (S (VP (VBG using) (NP (NP (DT the) (NN sunlight) (POS 's)) (NN energy)))) (. .)))))))) (S (NP (DT This) (NN process)) (VP (VBZ is) (VP (VBN called) (NP (NN photosynthesis)))) (. .)) (S (NP (NNS Animals)) (VP (VBP are) (NP (NP (DT the) (NNS consumers)) (PP (IN of) (NP (DT the) (NN food) (NN chain))))) (. .)) (S (NP (PRP They)) (VP (VBP eat) (NP (JJ other) (NNS plants) (CC and) (NNS animals)))))) (. .)))
The lowest  part of the food chain are the plants. They are called producers because they  produce their own food using the sunlight's energy . This process is called photosynthesis. Animals are the consumers of the food chain. They eat  other plants and animals.
(ROOT (S (NP (NP (DT A) (NN consumer) (CC and) (NN producer)) (PP (IN in) (NP (DT a) (NN food) (NN chain)))) (VP (VBP are) (VP (VBN involved) (SBAR (WHADVP (WRB when)) (S (NP (DT a) (NNS deer)) (VP (VBZ eats) (NP (DT a) (NN leaf))))))) (. .)))