( ( The muscles ) ( then ( ( ( ( push ( the ( solid waste ) ) ) out ) ( of ( ( the anus ) ( as feces ) ) ) ) . ) ) )
(ROOT (S (NP (DT The) (NNS muscles)) (ADVP (RB then)) (VP (VBP push) (NP (DT the) (JJ solid) (NN waste)) (PRT (RP out)) (PP (IN of) (NP (NP (DT the) (NNS anus)) (PP (IN as) (NP (NNS feces)))))) (. .)))
The muscles then push the solid waste out of the anus as feces.
(ROOT (S (NP (JJ Solid) (NN waste)) (VP (VBZ is) (VP (VBN eliminated) (PP (IN from) (NP (DT the) (NN body))) (PP (IN through) (NP (DT the) (NNS anus))))) (. .)))