( Animals ( ( ( lack ( cell walls ) ) altogether ) . ) )
(ROOT (S (NP (NNS Animals)) (VP (VBP lack) (NP (NN cell) (NNS walls)) (ADVP (RB altogether))) (. .)))
Animals lack cell walls altogether.
(ROOT (S (NP (DT A) (NN cell) (NN wall)) (VP (VBZ is) (RB not) (ADJP (JJ present) (PP (IN in) (NP (NN animal) (NNS cells))))) (. .)))